If you've fooled around with lock picking you quickly learn that brand-new locks are quite hard. The more wear a lock has, the more tiny mechanical defects it h

If you've fooled around with lock picking you quickly learn that brand-new locks are quite hard. The more wear a lock has, the more tiny mechanical defects it has, the easier and faster it is to pick. Repeated attempts to pick a new lock - applying pressure and torque to the pins - will wear it down (much) faster than ordinary use.