Push bar doors, also called panic bar or exit device doors, are designed to let people out in an emergency but restrict entry from the outside. Unlocking one from the outside depends on what type of hardware is installed on the exterior side of the door. Most push bar doors use one of four methods: a keyed cylinder, a dogging mechanism, electronic access control, or exterior trim with a lever or thumbpiece.
Check What Hardware Is on the Outside
Walk up to the exterior side of the door and look at what’s mounted there. You’ll see one of a few things: a flat pull plate with no handle, a lever handle, a thumbpiece, or a small cylinder (keyhole). Some doors have a combination, like a cylinder paired with a pull handle. What you see tells you how the door is meant to be accessed.
A flat pull plate with no cylinder means the door is exit-only. There is no mechanical way to unlock it from outside without changing the hardware. These are common on emergency exits where outside entry isn’t intended.
If there’s a lever, thumbpiece, or visible keyhole, the door has outside trim designed for entry. The trim retracts the panic hardware latch from the exterior when activated. Lever trim is the most common on commercial buildings and comes in different configurations: passage (always unlocked), storeroom (always requires a key), and classroom (can be locked or unlocked from outside with a key, then stays in that state).
Using a Key on the Outside Trim
Most push bar doors in storeroom or classroom function require a key to unlock from outside. The cylinder on the exterior side is typically a rim cylinder, which is the standard type used with exit devices in commercial settings. When you insert the correct key and turn it, a metal stem on the back of the cylinder rotates and retracts the latch, allowing you to pull the door open.
If you turn the key and the lever or thumbpiece spins freely without retracting the latch, the internal connection between the cylinder and the exit device may be broken or misaligned. This is a common failure point. The tailpiece, which is the metal rod connecting the cylinder to the latch mechanism, can wear out or disconnect over time. In that case, you won’t be able to unlock the door until the hardware is repaired or replaced.
The Dogging Feature
Dogging is a feature that holds the push bar in the depressed position, keeping the latch permanently retracted. When a door is “dogged,” it swings freely from both sides, no key needed on the outside. This is how many businesses keep their doors unlocked during operating hours.
To dog a push bar, you press the bar down and insert a hex key (Allen wrench) into a small hole on the face of the bar, then turn it clockwise. The bar stays depressed and the latch stays retracted. To reverse it at the end of the day, you insert the hex key and turn counterclockwise, releasing the bar back to its normal locked position.
Some higher-end exit devices use cylinder dogging instead of a hex key. The process is identical, except you use a key in a small cylinder on the push bar rather than a hex wrench. If you manage a building and want to allow outside access during business hours without issuing keys for the exterior trim, dogging is the simplest solution. Just remember that a dogged door is completely unlocked from both sides, so it offers no security until you undog it.
Electronic Access Control
Many push bar doors in offices, hospitals, and secured buildings use electronic systems instead of (or alongside) mechanical keys. You’ll recognize these by a card reader, keypad, or fob reader mounted near the door. These systems control whether the outside hardware can operate the latch.
There are two main electronic setups. The first is an electric strike, which is built into the door frame. When you present a valid credential, the strike releases and lets the latch slide through so the door can be pulled open. When the strike is secured, it holds the latch firmly and the door won’t budge from outside. The second setup is electrified trim, where the outside lever itself is controlled by power. When access is granted, the lever becomes functional and you can turn it to retract the latch. When it’s secured, the lever won’t turn at all.
A third type uses electromagnetic locks (mag-locks), which are magnets mounted on the frame that bond to a steel plate on the door. These are fail-safe, meaning they unlock automatically when power is lost. Electric strikes and electrified trim, by contrast, are typically fail-secure: they stay locked during a power outage. In either case, the push bar on the inside always allows free exit regardless of what’s happening with the electronics.
Why the Outside Handle Won’t Work
If you have the right key or credential and the door still won’t open from outside, a few things could be going wrong. The most common culprit is misalignment. If the door has shifted in its frame, the latch may not line up with the strike plate, creating friction that prevents it from retracting cleanly. Check whether the door is sagging or if the frame has warped.
A dry or corroded latch mechanism is another frequent issue. Commercial exit devices take a beating, especially on high-traffic doors exposed to weather. If the latch isn’t retracting smoothly, it may need lubrication or replacement. Loose mounting screws can also cause the entire exit device to shift on the door, throwing off the latch alignment.
On electronic systems, a dead battery in a credential reader, a network issue with the access control panel, or a simple programming error (your card was never authorized for that door) can all prevent outside entry. If you’re locked out of a fail-secure electronic door during a power outage, you’ll need a mechanical key override if one exists, or you’ll need to wait for power to be restored.
Accessibility Requirements for Outside Hardware
If you’re choosing or replacing outside trim on a push bar door, federal accessibility standards require that the hardware can be operated with one hand, without tight grasping, pinching, or twisting of the wrist. The handle or lever must be mounted between 34 and 48 inches above the floor. Lever handles meet these requirements easily, which is one reason they’re the most popular choice for outside trim on commercial exit devices. Round knobs and small thumbturns generally don’t comply because they require gripping and twisting.
The force needed to operate the latch hardware itself (turning a lever, for example) is capped at 5 pounds. However, the overall force required to swing an exterior hinged door open has no federal maximum, because wind, weather seals, and door closers make it impractical to set a universal limit for exterior doors.