So who doing the work she used to do during the 20 hours she is no longer at work?
You are - in the self checkout lane.
Was in Walmart the other day. They were down to 5 regular registers and 20+ self checkouts. Oh, and only one cashier/lane open, with 8 people in line.
It's a meme created to make a point about raising the minimum wage.
It is not an actual real life example of some gal working in a restaurant.
But if you can't quite figure it out, I'll help you out.
No one is doing the work so the service in the restaurant suffers.
Or the place eventually closes because the owner can't absorb the higher labor costs associated with a mandated higher minimum wage.
Or whatever you want the answer to be because it is a frickin' meme.