How To Lock Garage Door When Power Is Out. Typically, on older vehicles, when you press the door lock switch, power flows through a relay to the door lock actuator. It can work with either manual or automatic garage doors and integrates in with virtually all automatic garage openers.
Close the garage door manually and lock it. Placing a shim in the weather stripping near the top of the garage and sliding a bent clothes hanger in to flip the lever will enable the door to be opened manually. Make sure the door is unlocked when the opener is reconnected.
Drag down the manual release cord.
Please note that you should only use this method if the garage door is fully closed. Getting started with the most important aspect of your garage door, make sure to unlock everything from outside. Lift the garage door straight up until the door is fully open. If your garage door is stuck closed you’ll simply want to make sure the door is firmly closed.