A garage door lock system is described which resists prying open while facilitating authorized opening of the system in the event of a power failure or other malfunction. The system includes a lock box (16) fastened to a door frame, and a solenoid (22) mounted in the box. The solenoid has a plunger (24) which can pass through a hole (26) in a latch mounted on the garage door when the door is closed. The solenoid is mounted so it can be manually moved to an inward position to withdraw the plunger from the latch hole to permit opening of the garage door in the event of a power failure. The solenoid is flexibly mounted so it is not broken free when the plunger is pressed to one side by a vandal or pressed to the opposite side by the door closing when the plunger is extended. An alignment rod (56) which is coupled to the plunger, biases the plunger back towards an orientation in alignment with the plunger-receiving holes in the lock box and latch when sideward pressure in either direction is removed.