hello there !
the panel needs to be removed !! on the grab handles on both sides there is a screw remove on both sides then pull the panel off of the hatch!!! they are held by metal clips!!
then you can get to the latch!!
note most likely the lock cylinder assy is frozen up due to corrosion and rust you can try use some pb blaster and work the linkage free !! if it still tight then the cylinder assy and maybe some other linkage points need to be replaced!!
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