The bank will only allow the locker holder to operate the locker. Mere possession of the key will not allow access to the locker.
A locker is opened by using two keys-
- One that is in the custody of the customer and
- Another one that is in the custody of the banker.
The locker will open only when both of these keys are used together. So a banker accompanies the customer to the locker room, puts in his keys along with the customers’ and opens the locker. Then he takes his key and leaves the room.
The locker can be closed by the single key only- which is in the possession of the customer.