Why not start by making it voluntary?
That is, just offer a job to anyone willing and able to work and see what happens.

George Osborne to target unemployed in speech

By Katrina Bishop

September 30 (CNBC) — U.K. Treasury Chief George Osborne unveiled plans to overhaul unemployment benefits on Monday, as he attempts to boost his party’s standing in the polls.

Speaking at the Conservative Party Conference in Manchester, Osborne said that those who have been out of work for three years will have to take part in a new government scheme – or risk losing their welfare benefits.