Tenant leaves front door open

[Barbara S.]

I don't know what to do. I have a tenant that keeps the front door to my 3 family investment property open all the time. Every time I go there, the door is unlocked or not pushed shut. I confront him all the time on this and he says it isn’t him, even when I have witnessed it with my own eyes. I have asked, begged and yelled about the safety situation and he just doesn’t care. What can I do? 

[Christine Kankowski]

Is it listed in the lease to keep it closed?  Could you have an automatic lock put in  with a self-closing hinge?