Did you even read the article. This is not working a family or neighbor family. This is commercial businesses who are forcing these kids to work the fields. Plus they are not even getting paid minimum wage. No wonder they got slapped with a fine.
Picking berries is piece work and I don’t believe you could force a kid to work unless it was fair.
The business would not be able to "force" the kids to do anything if the parents did not allow it. The parents determine what the limit of the working hours are.
In which case, you have EXACTLY the same situation as kids working a family farm, where their parents decide the maximum work hours there.