Deputy county sheriffs appointed pursuant to RCW 36.16.070 and chapter 41.14 RCW are exempt from the state minimum wage act (chapter 49.46 RCW) by reason of so much of RCW 49.46.010(5)(k) as excludes any individual ". . . who holds a public . . . appointive office of . . ." the state, any county, city, town, municipal corporation or quasi municipal corporation, political subdivision, or any instrumentality thereof.