Unlocking the safety frontdoor with keys needs more than one turn. Then closing and locking it again. The second unlock has a pause before the mechanism finally unlocks the door. At the end the door is getting locked from the inside with keys.
I unlock the front door, then leave it open to hear the ambient sound from outside, then i close it. Recorded with zoom h5 recorder (xyh-5)october 22, 2018.
Wooden door. . . Key is quickly inserted into a lock, turned and the lock is "unlocked" - stereo 44. 1 khz 16 bit interior. . . Recorded with sony mini-disc recorder 2005.