Retail employees will not complete tasks

Oof, I made a retail shop but after a few hours decided to sell it off. It's far too much hassle, you gotta be there for it to run so you can't just hire a few employees and leave it to fend for itself like you can with the vets, and the employees often don't do what they're supposed to do. I've seen sims stood around getting angry nobody was ringing them and when I checked my employees they had totally forgotten all about the tasks I set them to do that morning! Instead I had to run around ringing customers before they disappeared that by closing time I had a load of stuff I needed to restock which I would've done myself if I wasn't chasing after customers all day that the other employees should've been doing. >< Also the profits were negligable after paying wages and restocking supplies.