Let's take a look at the list of charges you could get for this:
-Trespassing on private property (Being on private property on which you were not supposed to be)
-Breaking and entering (Using force to get into the building; opening the lock and opening the door)
-Petty theft & Burglary (if you took anything, and I mean ANYTHING)
-Mischief (Entering for the purpose of disrupting communications)
Combined, you could face up to a year in prison and $6000 in fines.