Abstract: A door exit device has a pivotal panic bar that is depressable from a raised position to unlatch a door. A lock assembly for the device comprises a pivotal member movable between an engaged position with the panic bar to hold it in its raised position and a disengaged position to permit pivotal depression of the panic bar and opening of the door. The member is mounted on the door and a locking feature is provided to hold the member in at least one of its engaged and disengaged positions. In two described embodiments of this invention, the member comprises an arm pivotally mounted for vertical movements to engage a cross-bar of the panic bar, in a third embodiment an arm pivots horizontally to engage a lever arm of the panic bar, and in a fourth embodiment the pivotal member comprises an extended end of a torsion spring adapted to engage and hold the panic bar in its raised position.