OK here's what you can do (off the top off my head anyway so get back at me if anything doesn't work):
option one: open a file in your BG2 directory called baldur.ini (make sure to make a backup copy!)
Then under Program Files, type this: debug mode = 1
Now, while you're playing the game, press Ctrl + Spacebar and you can type in cheat codes. For a list of codes check this link
option 2: Alternatively, you can download Shadowkeeper here and use it to add the key to your inventory. In Shadowkeeper, you can also look up the cheat codes of all the items in the game. it's easy to use.
Good luck!
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