Sounds like the door handle lever has snapped and is jamming the door lock.
If this is the case you'll need a new door handle but you've got to get yours off the car first which means opening the door somehow.
I'd jiggle all the locks and hope to get lucky otherwise I'd be pulling the door liner off and poking about in there to try and free up the mechanism.
If I got real desperate and still couldn't open the door, I'd cut the door handle off the car aiming to destroy the lever mechanism while I was at it.
Pete
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