They always sold pork and have needed people to store it and to check it out.
If your religion bans you from doing those jobs then you can bring carts back.
What happens if he won’t ring up kosher foods or Israeli labeled products like couscous? Can he refuse to handle those?
What happens if he won’t handle someone with a service dog, as Muslim Somali taxi drivers have done?
No, can’t bring in the carts because pork was in them.