a locker that may either be opened in a keyed or keyless manner includes a locking mechanism formed predominantly of sheet components . the locking mechanism is designed to be carried by the frame of the locker , and is particularly suited to enable the locker to be used as an evidence locker or similar restricted access storage compartment . various spring biases are used to force the locking mechanism to a locked position when the locking mechanism is appropriately triggered , such as by a pushbutton . the locking mechanism is designed to be substantially tamper proof and cannot be reset to an unlocked position without a key , if equipped , or access to a lock resetting lever arm that is only accessible through a rear opening of the locker .