I went to two stores today. First, Trader Joe’s, a small place. They had customers line up outside, with six feet between each family/couple/person. When a family/couple/person exited, another could go in. A woman acted as host, explaining the bagging policy (preferably let them do the bagging with a fresh paper bag, if not use your bag and fill it yourself while they stand back) and waving people in. She did a great job acting as emcee, keeping up the banter and making the wait tolerable. It was warm-ish and sunny, so that helped a lot.
The check-out line had six-foot-spaced tape lines on the floor, stretching way back in the store, leading to another director. When a register became available, she pointed you to the right lane. The checkers took the basket or cart and had you stand back while they scanned and bagged it. Then they said come over and pay. It smelled of alcohol because they wiped everything down between customers.
The second place was a bigger chain store (Kroger-owned, named Pick ‘n Save). It was more like business as usual. Customers were maintaining distance, but the store wasn’t doing much to direct it.