Ethical Problem

my ethical problem is
A man has been sentenced to prison for armed robbery, and admits guilt for the deed. "But", he argues,"I'll never do anything of the kind again. I'm not insane or a danger to society. I would be happier out of jail than in. My wife depends on me for support and she and the children would be far happier if I were able to be the family breadwinner again. As to the influence on others, almost no one would ever know about it; you can keep the matter out of the newspapers and no one except you will ever know that the crime was committed.Therefore, you should release me" Assuming he is correct, what would you do?

I would sentence this man to 5 years in prison and early parole. this sentence would be to still punish this man for he's wrong doing and hopefully he won't do it again. but if he has done some prior crimes he should get a more severe punishment than if it was his first crime.