When I taught lock picking as part of a locksmith program about 15 years ago, I’d bring out a Kryptonite Fahgettaboudit chain and U-lock. It would pass around the room with the students unlocking and relocking it with the tubular key. I would take the lock back, disassemble my round (not hexagonal) Bic pen and pick the lock open in about 3 seconds. It was sure way of getting them to pay close attention to the lesson.
Their locks had slightly smaller keyways than the conventional Ace locks but were Bic perfect.
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