I've just submitted a post about this and everything I tried first before I finally found out about the "violence" bit. I've just then seen your postThanks for the manual and trying to help.
My son's mate is an auto locksmith, and told me that when the mechanism goes, it's time for violence.
I took the pass seat out, managed to get the door card off.
I then took my angle grinder to the internal metal door skin, cut a window in it, then with a hammer and chisel smashed the lock mech up. Eventually got to the bare latch, and managed to operate it with a long screwdriver, and finally got the door open. Got a replacement lock unit from Ebay. All fitted and working again. Happy ending.
Thanks again for the help
Glad to hear you solved it in the end