We had same thing,2 different latches . I opened the door ahead of the stuck door so I could get to the hinge bolts of stuck door and removed them and stuck door comes right off. After removing the latch I found the screw the holds the pivot point of latch had backed out enough the it allowed the handle to move without operating the latch,I tightened the screw and all was good. Reinstalled door all good,but when it happened again to a different latch,did the same thing and found same screw had backed out,so I went back and put lock tight on that screw on all latches all good ever since . You can also call Thor they can give you part number,and maybe a free replacement latch.
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