I do agree with benjadaninja, I think the concept itself is interesting, as I do like how the tables turned towards the end (you could spot it as soon as the guy shot the key though). I didn't like the look of the guy, he was a little anatomically incorrect.
Pacing could have been better, much snappier and quicker. I would say this also goes for the animation, but I can see that you have potential to improve! Keep doing your thing dude:)