The Office of Terror

You zoom past the papers, knowing you're lucky to get a second chance to escape. You zip into the next room and slam the door shut. Immediately after that happens you knew you messed up. You realize in your head,"There's something in this building. When a killer is in the building you need to be quiet. The door when it slammed shut was loud. The door slamming revealed my location." That realization has made you know fear for your life. You know hear footsteps getting louder and louder. You pull your phone out of your pocket trying to call for help. You could lock the door, but if you call for help the killer will get to the door. Calling for help, however, can save your life. What will you do?