The govt don't need to enforce lockdown, the shops are doing it for them by making the whole shopping experience irksome.
Walked into town to go to 2 shops and in each case had to walk to the next steet as only the side doors were in use, walk up and down several flights of stairs as the escalators are only at the main entrances, then queue to get in.
Apparently only 6 customers allowed at any time, even in quite large shops with 2 storeys.