Any department, division, bureau, commission, or other agency of the state of Washington or any agency of any political subdivision thereof or the federal government may use, or cause to be used, prisoners confined in state penal or correctional institutions to perform work necessary and proper, to be done by them at camps to be established pursuant to the authority granted by RCW 72.64.060 through 72.64.090: PROVIDED, That such prisoners shall not be authorized to perform work on any public road, other than access roads to forestry lands. The secretary may enter into contracts for the purposes of RCW 72.64.060 through 72.64.090.