If you know you are not supposed to be there it could be crimminal tresspass, breaking or entering, or even commercial burglary, which is a class C felony. Having said that, if your employer or someone else gave you a key and didn't tell you not to go there, you're probably fine as long as you are not in there doing something you know you're not supposed to do.
The short answer is yes you can. Will you is another story. Did you have permission and authority to enter the building in question and be there at the time you were - that is what must be asked. If you care charged - look to to hire an attorney to represent you.
The million dollar question is: Do you have a legal right to be there? If you don't and go in anyway, you are guilty of criminal trespass--and perhaps other, more serious, crimes as well, depending upon the circumstances. Whether you will be arrested and/or charged with a crime is another matter. But if you have any doubt about your right to be there, stay away!
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