The lesson of The Shawshank Redemption is compliance. The film is about life, and Shawshank prison stands for the institutions to which professionals devote their careers.
It seems to be a story of freedom. It is not. The film affirms a myth that all professionals are taught: They are more intelligent and better educated. They are more sensitive. Unlike the faceless masses, they are unique individuals with freedom in their hearts.
That freedom is a myth. It may exist in their hearts: but to earn it in the world, they must serve. The price is compliance. Its price is life. Thinking they are free, they become their own jailers. Real freedom is the carrot on the end of the stick: grind away your decades and in your old age you can earn the dream of retirement.
The institution where you work? It may be brutal, the management may be corrupt - but the institution is necessary. You are a superior individual. Redemption is something every man must earn for himself. There may be companionship here, but not solidarity. In the end, work will set you free.
See Jeff Shmidt's book, Disciplined Minds: A Critical Look at Salaried Professionals and the Soul-Battering System that Shapes Their Lives.
Also mentioned: Brian McDonald's You Are a Storyteller podcast.