In article ,
The Natural Philosopher wrote:
WD 40 has been known to work, and pressing teh door aginst its seal to
take pressure off.

Yes. In this case I'd certainly try soaking it in WD 40 as I'd be
replacing it - or stripping it down to see what the problem is anyway. But
if it *does* work, the WD40 needs to be cleaned out afterwards as it will
quickly attract dirt and jam the lock again.

--
*Why don't sheep shrink when it rains?

Dave Plowman London SW 12
RIP Acorn