see a ghost

I was at work one morning, preparing to open the store with another girl. All the doors were locked and there was no way anyone could have gotten inside. We were sitting down when I looked into another room and saw a man standing in the doorway, staring straight at me. He was wearing a dark suit and he was definitely there, but not completely solid. It was strange and hard to describe. And then I blinked and he was gone. I told the other girl that I had just seen a man, and she described him perfectly before I said anything else. She had seen the same man earlier that morning. We searched the store and all entrances to see if there was any way a real man could have gotten inside or if there was anywhere for him to go from that doorway. And there was no man in the building. Yet I saw him, plain as day. He was kind of fuzzy around the edges and pulsating, and he actually stared kind of through me, not right at me. His eyes were dark and they haunted me for weeks.