Case Studies - Does it violate their rights?

CASE #1
Stu Pidiodit went to his job at Mal-Wart. While he was there, he waited to get his break. Instead of asking, he decided to take his break at exactly three hours. His manager wrote him up and he sued, claiming that Mal-Wart owed him his break.

CASE #2
Joe Schmoe worked at the grocery store, where he was told to always use gloves when pulling the dry ice out of the container. On one occasion, his boss told him to go get the dry ice. When he went to the container, there were no gloves. As a result, he pulled the dry ice and badly burned his hands. Did the grocery store violate his rights?

CASE #3
A thirteen year old girl volunteered at the food bank. The work required her to lift boxes of food. Despite the hard work, she said it was worth it. However, her older brother claimed that the work was an example of child labor. Did the food bank violate her rights?