1- accessing someone's computer is like accessing someone's home - checked
2- unauthorized access of a computer system is a crime - checked
3- the kid should be taught a lesson - checked
But... do u have to destroy his future for it? A 14 years old kid should drag a fellony with him till he graduates from university, because he decided to prank his teacher? That if he's allowed access to a university with such a record.
I thought law and punishment's roles are to reform and teach. (slapping myself... wake up!)