A lock including a housing and an opening for receiving a locking bolt moveable between a locked position and an unlocked position is provided. The lock also includes a rotary actuator having a rotary output of a predetermined amount and responsive to entry of an electronic combination input by a user; a cam wheel operably coupled to the housing and responsive to a manual combination input of the user, the cam wheel including a cam way; a bolt release lever moveably coupled to the housing and including a nose portion engageable with the cam way and a locking bar; and an armature post responsive to both the rotary and manual inputs, the armature post moveable between a blocking position for blocking the locking bolt in the locked position and an unblocking position for allowing the locking bolt to move into the unlocked position.