Thats the outside outlet. The small ball and spring to keep the door from flapping going down the road, can rust in place if not used, and a little oil once in a while. Place you a small piece of wood or plastic to keep from chipping the paint, and gently pry open. Try to oil the ball and spring, if the spring is not completely rusted away, you should be able to get it working again.
Chris & Brenda, Members of the Christian Motorcyclists Association
AIR Member 12654
1982 310 MoHo
Many Years ago, 1972 Argosy 24' trailer
Our Toad, 96 Saturn SW2 (250,000 and still going