Unarmed security is only "eyes on site" in case of emergency so the company being guarded can pay less for insurance. It's easy work. Tons of routine. Mild paperwork. Ungrateful clients. A mixed group of coworkers, you meet all kinds on site. Supervisors can be the worst, I got lucky. You are a greeter for elitist snobs and a slight deterrent to minor criminals.
I enjoyed the job, but it suited my needs at the time.