Litter picking during the school day was a form of punishment for pupils at my previous school when they were given a detention but were unable to stay after school finished due to the school buses. This applied to all years from first formers to the upper sixth with no exceptions. Of course, that was 50 years ago, enforce a similar regime now and parents would soon be complaining on the grounds of human rights!
It seems we are overcome in society by inconsiderate, ill mannered, disrespectful snowflakes!