The best way is to remove the front seat you can get to all the screws the hard part is when it comes to removing the door card it’s like a good hard tug on the door pocket but not to hard or try to get your fingers in between the edge off the door card and the door bye the door pocket then go round the rest off the door card then try to unhook all the wires from the door card and the door release the cable form the handle then lift the back off the door card up at a angle so you can get the front away from the glove box and remove it from the door then drop the door window so you loosen the two bolts holding the glass to the mech and pull the window back up to the top tape it in place then remove all the 10mm bolts holding the metal plate to the door then get a towel and put it on the plastic trim on the door sill just to
help on not scratching it with the window mech as your getting the plate out from the door as it’s a bit tricky with the door shut
Once the plate is off have a cuppa and cool down lol
Then find a hammer and a bar or long screwdriver and set about trying to separate the lock so you can open the door
I had a customers car come in with the same
problem but he did not rebuild the door back correctly and broke the big part off the lock mech so it moved towards the door skins side to side so if I pushed it towards the outside off the door it would let you open the door
Once door is open I’m sure you know the rest
Good luck
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