A creaking metalic sound came from the door, awakening Erin. She raised her eyes and looked to the front. Someone was opening the elevator. Erin waited expectantly for a moment, and after a few pulls, the door clanked open.
I pretty sure I should be using different verbs instead of pull and clank. But I can't think of any. The first should refer to "applying force with a lever" and the second to "opening a door with a loud sound".