Well, first off, stress from all the work because they have to do school at the same time. Also, they have to be at their work place at a specific time. So, transportation doesn’t help either. They could be taking a bus, or driving (depends). Another reason could be because of fellow employees or their boss. Sometimes, employees can make the teenage worker nervous. This goes the same with their boss. Maybe there’s an employee that’s annoying or completely rude. And maybe their boss is super strict about arriving on time or doing something wrong. Who knows.
That’s all I can think of right now. Hope this helps! <3