Our grocery stores have signs on the windows  "NO Mask, No Admittance."  Also no re-useable bags allowed into stores.  Well there  goes my stash of very attractive animal theme burlap bags.
Plus the grocery store has floor signs,  for each aisle. Some you must enter from back of aisle,
the next will be from front of aisle. ONE WAY ONLY. and so on. Also carts must be 6 feet apart.
If someone is already shopping in the aisle you are supposed to wait till they depart.
 
I didn't notice the signs at first- I don't usually scan the floor when grocery shopping, except for one time when a mouse scurried away.  My brother said they'd arrest me.  I told him they will never take me alive.  If they do kill me I told my brother to sign onto BYC as me (automatically on my computer) to let BYCERS know.