Except as specified in subsection (b) of this section, every gate or door opening through the enclosure must be equipped with a self-closing, self-latching device that keeps the gate or door securely closed at all times when not in actual use. This section does not apply to the door of any dwelling house that forms a part of the enclosure. City Code, 1976/83, art. 19, §184(b) Ord. 99-548