Tight job market is good news for felons, disabled and other hard-to-employ, but will it last?

At 49, Marshall May Jr. could not remember whether he had ever taken his mom out for a meal.

Certainly not in the last 20 years when he was in and out of prison, serving seven separate terms for crimes like stealing to support his drug habit. He last held a regular job in 1994, as a front desk...