Thanks for the feedback, even though you're not a big fan of puzzles. This one I agree is can be confusing, and that's why I made the post, I wanted to know if people were getting stuck on it or if it detracted from their enjoyment of chapter one.
The thing about it is that each time you pick a wrong locker, your potential husbando Emerson will start helping more and more. And this is my opinion, but that is a fun way to do it. Not succeeding has no negative consequence - on the contrary, you get more interaction with Emerson, and despite him being on the down right now, when he gets to help out, his naturally caring disposition gets to shine through. You'll see a bit of his true self, and there's some playful banter. So, in your case my advice would be: Don't feel like it means anything to get the locker right. Enjoy receiving help from a charming dragon?
Or if you want the solution, send me a DM on FA or Twitter, and I will tell you where I don't spoil it for anyone else :)