Didn't have one at primary school, we used ask the butcher to help us get across. Presume he got fed up doing it as school informed us we weren't allowed to bother him any more. No worries about our safety! But this was the sixties.
Lollipop man at my children's school was a miserable old sod. Not surprising, given the princesses in 4 by 4s who would regularly give him grief.
I've got another 'keen'... Ouch!