Could be where its 30 minutes til closing they are just trying to get everything cleaned up so they can close at 10. I cant say for sure but its possible.
Many places close the kitchen and stop accepting new orders some time before the restaurant actually closes. So the staff has time to clean and can go home. I don't work there and don't know if that's what's going on in this case but just a guess
Thanks! Your answer is awaiting moderation.