Federal Criminal Attorneys:
18 U.S. Code 1752 says, "whoever knowingly enters or remains in any restricted building or grounds without lawful authority to do so with the intent to impede or disrupt the orderly conduct of Government official functions, engages in disorderly or disruptive conduct in, or within proximity to, any building or grounds when their conduct impedes or disrupts normal business ... ."

The penalties for violating this federal law depending on the specific actions taken and the circumstances surrounding the crime:

For basic incidents of trespassing on restricted property: the crime is prosecuted as a misdemeanor, and you could face a maximum sentence of one year in jail as defined under 18 U.S.C. 1752(b)(2).

If you carried or used a deadly weapon during the incident, or if anyone suffered significant bodily injury due to the incident: it's charged as a felony, and you could face up to 10 years in prison if convicted as defined under 18 U.S.C. 1752(b)(1)(A).