The Rocketeer

Cliff Secord's (Billy Campbell) keychain can been seen when his pockets are emptied in Howard Hugh's office.  His keychains are a blank metal circle, possibly a bullet, and a disc used for calculating for flying, which makes sense because he is a pilot.

The Division 2 (Video Game)

In the game The Division 2 keychains are collectible items.  They serve no purpose in the game other than being a collectible.  You can display your keychains on your backpack which is visible during gameplay.  There are many that you can find.  I only included two in the photos above.

Antiques Roadshow (UK)

I have only posted from scripted media before BUT I can do whatever I want so here's this... From the most recent season of the UK Antiques Roadshow, a couple had a keychain that went to the royal train in 1912. The king of the United Kingdom in 1912 was George V. The expert appraised the value at 200 to 400 pounds.

(from season 37 episode 5)