I bought a bath door lock at Lowes as well. It has a small key that unlocks from the outside, and it hangs on a pin above the door, in case anyone gets locked in.
2006 Damon Daybreak 3276 35'with 5 Star Tuner. 3 200 Amp Lithium batteries and 2000 watt PSW inverter/charger. 2013 Elantra on a Master Tow dolly.