Cal. Penal Code § 469

Any person who knowingly makes, duplicates, causes to be duplicated, or uses, or attempts to make, duplicate, cause to be duplicated, or use, or has in his possession any key to a building or other area owned, operated, or controlled by the State of California, any state agency, board, or commission, a county, city, or any public school or community college district without authorization from the person in charge of such building or area or his designated representative and with knowledge of the lack of such authorization is guilty of a misdemeanor.