A banking system operates responsive to data read from data bearing records. The system is suitable for securing the contents in safety deposit boxes. Each safety deposit box includes a door having a key lock. An assembly is installed on the door to limit manual access to the key lock to only individuals authorized to have such access. The assembly includes a body held in a key lock blocking position by a cover lock. A selectively programmable electronic key module is able to change the condition of the cover lock from a locked condition to an unlocked condition. The key lock can be manually accessed when the cover lock is placed in the unlocked condition.