I wonder if you can use the usual car burglary games to open a door.

Is there a keyhole for the boot (trunk)? Could you open that on a key and fight your way in through the back seat?

Is it cheaper to break a side window and then get a spare one from a scrapyard than to pay an expert to get into the car?

By the way, I'm not at all sure that a locksmith will be any good for this job.