Vintage Tiger 955i Gas Cap Issue

Hello! So I have a 05 tiger that has unfortunately been sitting for a couple of years, and as I'm getting ready to get it up and running again I found that the gas cap is not opening. The key won't turn at all. I've found lots of people online with fixes for a stuck gas cap which primarily revolve around penetrant/lubricant and a banging on the cap with a mallet to loosen corrosion which hasn't done the job for me yet.
I seemed to remember that the key in the gas cap doesn't go all the way in, but now I'm starting to second guess myself. Sorry for the dumb question, but can someone confirm that the key shouldn't go all the way to the shoulder?
Thank you!

 

I had the bike for a couple of years before it was left to sit, so the key has worked previously. Thanks for the reply!