I know you said no long TV Series, but like others have mentioned Prison Break is so so so good. Especially the first series. Awesome.
Films? Hmm. The Rock? Shawshank.. That's one of the best films ever, let alone a prison escape film. Wow.
Escape from Alcatraz is also very good, sorry it's been mentioned before! The Great Escape is also good, a classic in fact! Rescue Dawn is something a bit newer that is also a decent watch. What about Con Air? Have you seen that? Somewhat similar and also good!