While I am sure there is some forced labor most of the people working in those factories are there because it is the best place for them to be. In a lot if not most cases it is either work in a factory or starve.
Just like all the crappy manufacturing jobs the people did here at the beginning of the industrial revolution. They sucked a real lot compared to jobs today but looking at their choices back then it was the best game in town. There is and was a reason why so many people flocked to the cities to get those jobs. They were for us back then and are now for those in the third world the best way to not starve.
Should there be force involved? NO. Should we start making it so those factories can not hire whomever is willing to work? NO we should not, doing so will do nothing but end up killing people by taking away their only hope of feeding themselves.
The thought that somehow if we get all those kids out of the factories they will go to school and run around having fun in a park somewhere is so far from the truth it is not even on the same planet. All that will happen is those kids and their families will not have enough money to buy food and either the kids will starve or their parents will through them down a well somewhere.