An apparatus is disclosed for inhibiting an unauthorized person from occupying a seat. According to one aspect, a lock is operatively attached to the seat of a foldable chair to prevent unfolding of the chair. Further, the lock allows the chair to unfold upon obtaining an input code that matches an unlock code.According to another aspect, a blocking member is positioned to block a person from comfortably sitting in a chair. The blocking member can be repositioned to unblock the person from comfortably sitting in the chair upon obtaining an input code that matches an activation code.