Here’s a short video showing you how the sound was made and implemented…
And a download link for the door shutting SFX (.wav file, no copyright, no payment, no royalties and complete permission. All yours.):
https://drive.google.com/file/d/0BzWkEGPK9IoRXzdJUnpmMXoyYmc/view?usp=sharing
Could you show me how to do this? 
it’s awesome!!!
By the way, thank you so much! I wanted to work on my game to sell it (like $1) but I couldn’t use the SFX that he gave me. I also didn’t want to have to learn how to make a sound effect just for this, so this is really awesome. Again, thank you!