Behind the green door?

Slow blip day so have gone with the shadows on our newly-painted front door.

I googled what I thought would be song lyrics, only to find that a green door apparently symbolises…

…wealth, health and safety.
… a good time, as speakeasies in the Prohibition era were identified by having a green door.
… something to do with military intelligence.
… an invitation to salvation at church.
…a renewed connection to nature in Feng Shui.
… a 1972 porn film.

I just thought it was a song Shakin’ Stevens covered in the 80s!