Deadly Delivery

While delivering a package, you have been captured by a mad doctor in a psychiatric hospital. Your goal is to find a way to escape. There are locked areas and rooms in the clinic. You have to collect keys to open them. The mad doctor will be looking for you. But you can use the cameras to find out where he is and avoid him. Once you find the key to the exit, you can escape. Or is there another way to escape this situation?