Can't tell from your post what type of rig you have. Our TT does not have a refrigerator door lock, and I can't say I've ever seen one. What we do have is a little plastic piece slide mechanism next to the handle/latch, which is used to secure the door partially open (i.e, not quite closed) for storage so as to permit air circulation (at least that's what I think it is). Could that be what you are refer to?
2013 Windjammer 3008W
2006 Chevy Silverado 2500HD 6.0L w/Equalizer 4
Nights camped: 2012 (29); 2013 (26); 2014 (40); 2015 (43); 2016 (35)