Abstract: The lock assembly of the present invention is mounted in a lock frame. A slide member is disposed for translation within the lock frame. A lock bolt is pivotally mounted within the lock frame and extends through it for engagement with a door keeper in a door frame. A lock bolt detent is pivotally mounted to the slide member for maintaining the lock bolt in a secure position when the door is closed. Actuation of movement of the slide member results in movement of the lock bolt detent away from the lock bolt followed by pivotal motion of the lock bolt as a pin on the slide member engages the lock bolt and lifts clear of the door keeper. The door is sprung open by a spring loaded plunger which extends out of the lock frame.