I am currently trying to make a simple text based game for a school project and i am stuck in trying to make a key open a door and none of the tutorials are very helpful. I also need help trying to make one specific object open a container. If anyone can be bothered with helping me please do.

The second thing is really easy to do:

A locked door tutorial can be found in the wiki: http://quest5.net/wiki/Unlockdoor
Combine it with the following:
Create a door (door is locked) and a key object and add a "Use this on (other object)" to the keyobject.

Thanks a lot You have been really helpful!