Electromechanical lock

An electromechanical lock includes a user interface configured to receive input from a user, the user interface activating operating power for the lock; a memory configured to store access tables, the access tables including information on the keys allowed to open the lock; and an electronic circuitry configured to modify the access tables on the basis of the insertions of an associate master key and an end function key into the lock, the insertion of the associated master key initializing a programming mode and the insertion of an end function key causing the lock to exit the programming mode.