Argh.

My sliding door was balking yesterday, opening only hesitantly when I turned
the handle.  It seemed as if something wasn't releasing at the rear latch.
This morning it refuses to open at all.  And helpful hints as to what I
should look for when I get in there?  Maybe all it needs is some good
lubricant, right?  That's the sort of fix I enjoy.  But at this point I
can't even open it.

Matt