First of all ... these locks all seem to be generally of poor quality. I've fought with them for many years. Best thing I can suggest is to lubricate them well with something like WD40 and then just work them back and forth until they get cooperative. Works for me.
While on the topic of the storage area doors. I've been a little unhappy about the "sticking" of the doors against the seals. It always feels like I'm going to pull the seal right off it's track if I pull too hard or too fast. Recently I tried spraying the seals with the same teflon lubricant I use on the slide seals.
Recommended by our dealer, I use something called CAPTAIN PHAB Dry Teflon Lubricant. I use it religiously on the slide seals and it just occurred to me to use it on the storage door seals. So far ... it's great ..... no sticking at all.
This stuff, believe it or not ... is supposed to be made in Canada .... well .... better than China, HUH?????? I think it's marketed all over north America. You could look to your local RV dealer of check it out at www.captphab.com
I have no connection to this company or it's products .... but I've been very satisfied with the results.