Title of this movie? No one can leave the room?

PLEASE help me! I can't remember the title of this movie nor can I
remember its director and I am losing my marbles over it!
Pretty much, there is a group of people (upper-middle or high-class, I
think) who sit to dine and not only do they not eat but none of them
can leave the room in which they are sitting. The entire film takes
place within this room and no one dares leave it.
I think it was a surrealist film.
I think it was in French.
But it's not "The Discreet Charm of the Bourgeoisie/ Le charme discret
de la bourgeoisie" by Bunuel.
I may be getting some details of the two mixed up. I haven't seen the
other one in years.
Pleas help!