Management is lazy and incompetent. Coworkers are mentally Ill, criminals and are sometimes dangerous. It's called "Going Postal" for a reason. This is a stepping stone only type of job. I wouldn't make it a career.
This company has total job security but you are treated horribly. The amount of overtime you can work will make you stay for the money but it’s physically and mentally draining. Completely unsatisfying and unrewarding.