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If not tried yet you could have somebody with some weight lean into the back end of door very firmly (without damage of course) to relieve the door latch to pin pressure while again somebody inside works handle and unlock cables. Shoot some WD40 down on top of latch assembly and into any crevices and maybe some will soak in to do some good.
Past that the latch is screwed and you may end up with damage getting it loose. Take a long slot screwdriver or other driver rod and put on the latch assembly to shock it with hammer hits while again working the cables, you may impact the latch to pop unlatched.
Look close at your cable action, they may be working but not quite enough, as in overaction there may produce the desired result. I'll leave OP to guess at how far to go with that.
Study how the unlock mechanism works, on Ford Focus cars I found the unlock cable still worked but an odd problem to where on opening the door with the handle if the unlock tab was palmed by accident to lock at the same time then the latch seized up in both an unlock and lock condition at the same time. To get those loose you had to work the unlock cable BACK INTO the cable housing with visegrips on the cable itself to unseize the latch and then latch back to normal until somebody does it again. Comparing the working door cable movement amounts to the unworking one may give some insight there. You may find yourself yanking the other side door panel for learning.
If by some odd chance car was wrecked you don't straighten the body for that, you simply refit the door latching assemblies to suit the new condition. That can involve 50 different things, the brain being the main tool there. I have shimmed, washered, realigned, bent, and ground on many parts to get what I wanted there. They hope not necessary on most of them on the assembly line but sometimes a car has to be pulled out of sequence for special work when all the points-in-space do not quite line up there and one off work needed for that particular car.
You do what's needed to make it work and forever. Garages won't touch that type of work past a simple 'replace the part to fix' as there is no return on it.
Last edited by amc49; 05-06-2017 at 07:59 AM.