What latch the handle or the latch that engages the striker, if so hold the
door handle in the open position and get a screwdriver in the closed latch
and pry it open, then lube with some spray wd 40 or such and make sure the
door itself is not out of line and the latch is out of line with the
striker.

Call a cab, better yet, call for a ride on the short bus.

Many people use those rubber bunge cords to hold the doors shut.
You could give that a try.  It's relatively inexpensive.