The safe deposit locker is typically managed by the front office staff, as they are responsible for the security of guests' valuables. The master key is usually held by the front office cashier or the reception manager, who oversees access to the lockers.
- Head chef, Housekeeping staff, and Bellboy are not typically responsible for managing the master key to the safe deposit lockers. Their duties are related to kitchen operations, cleaning, and guest luggage, respectively.
Thus, the correct answer is Front office cashier.