sm_jamieson presented the following explanation :
I have a door with mortise lock and no key. Probably the original lock
from 1930s. Never needed to open that door before. I would really have
to damage the door to get the lock out. What is a reasonable price for
a locksmith to pick it ? I don't want it re-keyed, just opened.
Thanks,
Simon.

Grind off one end of the hinge pins and punch them out -That should
leave the door free to be pulled open at the hinge side. Remove lock
and obtain a new one to match complete with keys.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk