Look at the child safety locks, the ones that use a magnet to unlock. They also have a lever that once unlocked, can be flipped so you don't need the magnet to unlock it every time. I used these on a FW I once owned and they were great.
2015 Ram 3500 4x4 Crew Cab SRW 6.4 Hemi LB 3.73 (12.4 hand calc avg mpg after 92,000 miles with camper)
2004 Lance 815 (prev: 2004 FW 35'; 1994 TT 30'; Tents)