Mia – I believe, through experiencing similar dreams, exploring them and then meeting many other sent in, that this depicts a common human situation.
We can be crushed by difficult events, by the loss of someone, by an accident, by criticism or even by our own moods. Sometimes we allow parts of us such as love or creativity actually crush us. Perhaps without being really aware of it, you already know your body is a screen. When you see a film or read a book you might be moved to laugh or cry, or shout out in fear. Considering that the book and film is not reality, what is happening? Well you are trapped by your feelings of fear, and the drama of your dream tells you that your conflict/soldiers invaded and took everyone to an isolated camp/prison. But you also has a part of you that were training in secret that hadn’t been captured n were preparing to possibly fight back.
That may be because you are slowly beginning to explore your dreams. Dreams can throw light/understanding into the dark/unknown parts of yourself. Maybe that is why you managed to get hold of a set of keys that unlocked the prison. That shows that you are learning how to free yourself from what imprisoned your ability to grow and expand and go beyond your limitations. See
https://dreamhawk.com/dream-encyclopedia/ways-to-go-beyond-limitations/Tony