They don't have to force children - particularly the precious children who don't want to.
They could walk away and say "Dont bother"
They could chivvy, help, explain etc and if met with continual resistance - request the child makes up the time - and we don't know if the child did finish - maybe she did
But - I do know that teachers work hard - they have targets to meet and for children to feel confident and happy in school they need parental help - support - backing
For parents to believe they are doing their best by each child in their class - yes they do get it wrong - sometimes - same as parents get it wrong sometimes - we are all human.
It is not unheard of for children to miss breaks
My DD has extra support for literacy - which due to cut backs the teacher supports at lunch time - there's a few of them - she doesn't have to go - the teacher doesn't have to give up her time - but she does -
If my DD misses golden time - she misses it - it happens when the assessments need to be finished and marked - it's not a big deal -
DD doesn't have additional needs - she needs a boost -