What movie is it where this younger person leads a few other to like underground bunker bombshelter and they get locked in one guy gets killed he hid soda the key was there after all?

You're describing the 2011 film "The Baytown Outlaws".

Here's why:

* Younger person leading others: The film features a young boy, "Little" Billy, who leads a group of misfits on a quest.

* Underground bunker/bombshelter: The group goes into an abandoned bomb shelter.

* One guy gets killed: One of the group members is killed by a booby trap inside the shelter.

* Hidden soda/key: The key to escape is hidden inside a can of soda, and the deceased character's backpack contains a collection of soda cans, creating the mystery and the solution.

Let me know if you have any more movie mysteries!