The Torah has no concept of prison as a punishment. Why? Because prison is a futile place. A place where you are told, "You must be here, but you must not change what this place is. You will grow older, but you must not take charge of your life. You will live, but you must not give life."
But a living human being must make change in his world, must take charge of his life, must give life to others.
There are times G‑d will put a soul in prison — often a very lofty soul, such as Joseph. It is like being held in a vice. Squeezed with the ultimate of futility, the deepest powers of the soul break through.
The worst prison is when G‑d locks you up. He doesn't need guards or cells or stone walls. He simply decides that, at this point in life, although you have talent, you will not find a way to express it. Although you have wisdom, there is nobody who will listen. Although you have a soul, there is nowhere for it to shine.
And you scream, "Is this why you sent a soul into this world? For such futility?"
That is when He gets the tastiest essence of your juice squeezed out from you.
See also:
The Black Carriage
Days of Light

Prison Test od G-d When I was put in Jail, innocent, I was first questioning G-d why He did allow this to happen? Instead of being angry with G-d, asking for justice and vengeance ‘my’ way, I should be thankful for it! But that is against my own emotions! But slowly on when I continue in my Torah-studies, I was going to realize more and more that the very G-d Himself was ‘pruning’ me, and showing area’s in my own life that was in a need to be changed! During the intense daily studies of His Divine Word (Torah); it had changed me, even I though “I was OK”, but G-d was thinking different! I was living my own way under the ‘permissive will’ and not under His ‘perfect will’! I was following my ‘own’ ideas and mindset thinking instead that of G-d’s! I was under the impression I was under His ‘perfect will’, but I was blinded in some areas of my life! I was in a need for some ‘adjustments’ by HaShem! It seems to be strange, but I am thankful to G-d of His Divine operation for my personal life! Yes, the arrest of the police is based on (again) on false accusations, but G-d was working all things in behalf of them who love G-d and who walk obediently according to His Divine purpose.