The problem was (as DW called it) the toilet seat broke that holds the latch. See first photo. My Rube Goldberg fix is photo #2. Door was hard to close ever since we had, so my guess has been it was broke a long time. When in frustration, DW slammed shut the door, the other side that was still holding the latch, it dislodged from the good side and would not work at all after that. Door shuts very easy now, which it has never done as long as I can remember.
Before Fix.. see broken piece.
Rube Goldberg fix.