I Am A Bit Disturbed

Uhh, so I have work today. My job is to open the building this morning. I keep hearing noises inside from farther into the place I work at (it's a fairly big facility, a Rec centre basically). It's 10:08, and the other person who should be on working with me should've been here at 10:00. She's usually five minutes early. I keep hearing weird shit and I'm actually a little creeped out. At one point I heard a sound like fabric rubbing together, as if someone was walking. I haven't explored yet, and I don't feel like it either. Nobody else should be here yet, and all the doors were locked shut when I got here. Nobody could be inside, but why the noises? D: