Is this supposed to be funny? To even think of it, let alone take the time to sit at your desk, draw it out, and post it to see what others think about it?
I feel like this could be one of those scenarios in the movie Divergent, where they force you into a dream-state to face your three worst fears. To break the fear I would try to knock off the door knob and use it to jam the conveyor belt. Or, if it was only a standard door, several kicks to the door-knob-area effectively breaks the lock.