You say this like kids would be forced to work. I'm very liberal, but child labor laws shouldn't exist except to make sure that 1) the kid actually consents to working and 2) the parents can't take the kid's money. I grew up in a household where my very Christian parents used not being able to legally work as a tool to keep me home and indoctrinate me. I was forcibly homeschooled, and work was my only interaction with other beliefs and political views, which couldn't start until age 16 for me. Then when I could work, really short hour limitations kept me from affording a car.
My point is that children should not be forced to work by the parents, government, or economic situation - but they shouldn't be forced to not work either. Especially for cases where the only way to get out of a toxic family situation is to leave at 18 - which isn't always economically feasible because they can't legally work enough.