Something like this happened to me as well, but it didn't directly impact my grades. In the 7th grade my teacher accidentally locked herself out of the shitty filing cabinet that was standard issue in every classroom. I had learned from my cousin a couple of really basic Lockpicking techniques, just raking and jiggling, nothing with actual pin picking.

I told her I could try to open it with a paperclip and she was like "yeah okay sure lol" totally sarcastically. I get down there, bend open a paperclip, and start trying to jiggle or rake the pins up. This process looks a bit like I'm struggling to do anything, so she immediately goes "see? You can't actually open it". I told her I just needed to get the mechanism to catch the pins, she became completely insufferable, and started making fun of me for being a 7th grader who knew a 10 dollar word like "mechanism". I honestly wish I was making this part up but for the rest of that school year she joked about me... knowing the word "mechanism". What a fuckin' nerd amiright?

Anyway I got the cabinet open after maybe a minute of fucking around with the lock and she barely even thanks me at all, mostly just acts sheepish because she probably never believed I could do it, and suddenly realized that a student could break into her cabinet where she keeps her teaching materials (not that I ever would have)