What are my consequences if I give a face ss when working a 4 day camp. ?

I'm on Unemployment. I will be working a 4 day camp and will be paid 250 dollars. I do not want to claim this money. What are my consequences if I give a fake ss number. I assume I will still get paid at the end of the week but will this cause a problem with the school when they do write offs etc. Its a state college in NH. I live in NY.