I had a problem with mine that seems to have gone away but was similar. If I closed the rear hatch and it didn't latch all the way, and in haste I hit the lock button on key fob, I had a hell of a time getting it open again.
I think I used some lithium grease on it and make sure that I close it proper now and I haven't had recent problems.
If you trip the claw lock thingie(yeah not the technical term) and it locks, you may need to work the latch while putting some sort of tool in there to get the claw open. Pencil may work in that regard, then lube it up good with white lithium grease.
see if that helps