For closing locks, a bump key can be used if the turning direction is opposite to the opening direction. If a bump key is used on an unsecured lock, there is a risk that unauthorized access followed by a closing action will go unnoticed due to the minimal damage caused to the lock.

 

The Use of Bump Keys by Burglars

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Bump keys can easily and quickly open standard cylinders commonly used in private residences and most commercial properties. These keys can also be made to fit almost any commercially available cylinder. Since this “opening method” is also used by burglars, both law enforcement and key manufacturers warn about its risks. However, there are effective methods to protect against such burglary attempts.