This is worth trying. It was done by a Georgia poultry processor several years ago: Georgia may use prisoners to fill farm labor gap

From the AJC:

The idea is to put nonviolent inmates -- who are spending the end of their prison terms at one of the state’s 13 transitional centers -- to work picking fruits and vegetables across Georgia.

The work would be voluntary for the prisoners. Pay would be set by farmers, though it would be at least minimum wage. Prisoners would pay for their transportation to and from the farms.