on the subject of crowbars again: how big does one need to be to be much use. can you prise open a locked door with the little ones. and i know people sneer at the super tough knives as 'sharpened pry bars' well are they? if i try breaking a chain with one am i going to end up with a razor sharp knife half in the face?
i keep thinking of the people on 911 who were stopped getting to the roof by a lock and the cleaner who got a bunch of people out by cutting through an interior door with his squeegee. in an urban environment it's going to have to be something pretty dramatic to be a disaster scenario; so rubble, jammed doors, or prising yourself out of a lift or vehicle don't sound that unlikely. is there some other solution than prying?
qjs
Depends on what you want to open. There are too many types of doors, door frames and locks to have an answer. Braking a chain with a knife seems like a waste of time to me. The forces needed to defeat most chains cannot be generated by a knife. If you want to open a door in a different method you could try a shove knife or lock shim. However this can create legal problems when the police find these items (or crowbar, knife, etc) on you.
As for elevators, there are special keys to open elevator doors. Note, elevators are equipped with safety locks that stops an elevator from moving when a door is open. If you open a door using a unconventional method, you could be bypassing this safety. This means the elevator might move even when the door is open. This is a mayor hazard when you try to escape an elevator. You do not want an elevator to move suddenly, when you are crawling out.
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