Someone Just Came Into My Apartment

At 1:49 pm today, someone came into my apartment while I was lying here on the floor asleep.  I heard someone put a key in the door and enter the apartment.  It sounded like a man's voice speaking.  He must have seen me because straight away he locked my door and vanished before I could get up to see who it was.  I called my son on his cell phone to ask him if it was him that doubled back around and he said, "no."  So, I called the management office to report it.  This is the second time someone has entered my apartment with a key besides me or my son.  The first time someone did that it was the maintenance man.  Here is that post: A Man Tried to Come Into My Apartment