It appears that Aaron Sander opened the door, probably after they knocked on it.
The woman testified she watched "ER" and made Befort a sandwich before the two of them went to bed for the night. He shut off the lights and locked the doors before going to bed at 10:45 p.m.http://www.freerepublic.com/focus/news/765713/postsSometime after 11 p.m., the woman testified, they heard Sander talking to someone at the front door, and a man burst into the bedroom moments later. A second armed man brought Sander into the room and gathered the other occupants into the room.