California Code, Business and Professions Code - BPC § 25658.5

(a) Any person under 21 years of age who attempts to purchase any alcoholic beverage from a licensee, or the licensee's agent or employee, is guilty of an infraction and shall be punished by a fine of not more than two hundred fifty dollars ($250), or the person shall be required to perform not less than 24 hours or more than 32 hours of community service during hours when the person is not employed or is not attending school, or a combination of fine and community service as determined by the court.  A second or subsequent violation of this section shall be punished by a fine of not more than five hundred dollars ($500), or the person shall be required to perform not less than 36 hours or more than 48 hours of community service during hours when the person is not employed or is not attending school, or a combination of fine and community service, as the court deems just.  It is the intent of the Legislature that the community service requirements prescribed in this section require service at an alcohol or drug treatment program or facility or at a county coroner's office, if available, in the area where the violation occurred or where the person resides.

(b) The penalties imposed by this section do not preclude prosecution or the imposition of penalties under any other provision of law.