I am both Sherlock and Watson! I literally sat and stared at this image for a few seconds and deduced that the passcode was 0179 although the door was already open due to the green light.<<This is post is hilarious I loved Watson at the end
update: I tried with all my songs and yes I know it doesn't work with every song. I just think it works if you play the song on time or it works with some sort of upbeat song. But yea, it doesn't work perfectly like you would expect.