Food shall not be sold at any cafeteria operated by a school district to anyone except pupils and employees of any school district, members of the governing board thereof, and members or employees of the fund or association maintaining the cafeteria; provided, however, that nothing herein contained shall prohibit the use of the cafeteria facilities by any work or harvest camp maintained by or within the district, and by persons entitled to use the school under the Civic Center Act; and provided further, that the governing board of any school district operating a

cafeteria may exempt by formal resolution of the board other individuals and organizations from the operation of this section including senior citizens participating in any program conducted pursuant to Chapter 6 (commencing with Section 9500) of Division 8.5 of the Welfare and Institutions Code.