Powercallsirens by popular demand now carries the basic "Shove Knife". This is the fastest, damage free means of opening residential and/or office interior doors that use “key in knob” locks. The Shove knife is used extensively in interior stairwells to slip spring latch locks. The design makes the knife work from either side of the door. If the door opens inward, you shove the knife in back of the molding stop and retract the latch. For doors that open towards you, the knife is slipped in from above or below the latch point and jiggled and pulled to retract the latch. A protective sleeve is added for when not in use.