About the one way systems and standing behind taped lines in shops.
Some didn't adhere to this and 95% of the time it was the elderly. We had a taped line before the checkouts - so created a corridor for those customers wishing to buy a few items they picked up at the far end of the store to pay at the kiosk or self scans. Security and staff asked customers to stand behind the line and wait until the serving customer moves past the cashier before unloading. A few apologised. Some got very abusive. A few times, elderly customers thought "oh nobody queueing" without looking at the queue, plonked their shopping at the top of the belt "I am very sorry, but there is a queue behind you" said by a mix of staff, security and other customers. Again more abuse. In the early days of the lockdown, the customers under 70 were more understanding and cooperative.
Self scans - there was no need for the whole family to congregate in the self scan area. Just whoever is paying. That caused so many issues when we had to approve customers for age restricted products etc. As they had all to step out of the 'booth' created by the dividing screens for each self scan, to allow us to approve this. The dividing screens made the self scan area even tighter for movement.
Kiosk was better. We knew what most customers smoked and when we got the cigs or rolling tobacco for a customer, we put what the regular customers usually buy on a ledge in the kiosk or asked colleagues does customer want their tobacco. Yes, got them and gently threw the products at colleagues.
Worst is the counting of customers. Having a car park underground the store with lifts. Fortunately, had two lifts so made one for entering the store and the other to leave. Needed a colleague in the car park and one on the pedestrian entrance for those customers who walked to the shops or parked in one of the car parks in the area. Had to communicate via walkie talkie to when to let customers in. Usually when a customer exited the exit lift, we let the next customer (only allowed those living together in their bubble in a lift together).
I think if we ever have another lockdown and restrict the number of customers, those who WFH or furloughed should work in the essential retail instead.