When unlocking a lock the first thing that a locksmith does is to assess the condition of the lock.  If the lock tumblers have been weakened by extensive use, it can affect their susceptibility to lock picking.  A dirty lock can also affect the effectiveness of lock picking.  Springs react differently on warm and cold days so the weather also plays an important part.  To make sure that the lock is not dirty the locksmith will clean out the tumblers.  If there is one piece of grit in th...


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