The sound of a "push bar to open" fire door being opened. It could also be used as the sound of a car door closing. Recorded on a zoom iq7, then mixed to mono.
Opening and closing the car door. Two doors opening and closing, generating audio with two different tones. Audio captured with zoom h1 in my garage and no noise.
Opening of a residential door with sound of bottom of door sliding across some carpet, followed by door shutting and then being locked with deadbolt lock.