Being told I should work at the local tech store instead of the employee behind the desk

This story takes place about 6+ years ago not long after I'd landed my first IT Support role, but I figured you guys would appreciate it anyway. On a visit to my local tech retail store, to pick up a replacement part for a personal device that I owned at the time, I made my way into the store & darted over to the technical support desk area. The queue was short, just myself then an elderly gentleman who was currently speaking to the guy behind the counter with his laptop out on the desk so as you do, I stood there & waited, headphones in & not really paying attention to what was going on. Ten minutes or so had passed and they were still chatting, the tech behind the counter was working on the machine so I figured while I'm here I'd go look around a bit, kill a bit of time then wander back over to the desk once they'd finished. After completing a lap of the store, I re-joined the queue behind the same guy at the counter. After another short wait it was starting to become apparent that they had clearly been there for a while, so decided to pop one of my headphones out & listen to what was going on? Then after listening I chimed in "Hi, sorry to interrupt but what problem are you having?" The elderly gentleman responded with "I bought this laptop a few days ago with a mouse, and I keep accidentally catching the trackpad/ keeps interfering with the mouse & we can't figure a way to turn it off?" To which I replied with "Have you not tried the shortcut on the keyboard, you should be able to press FN + F7 or something like that & it will disable it?" The tech behind the desk then looked at me, then back down at the keyboard on this gentleman's laptop & then pressed said key combination then within about 3 seconds the employee responds with "Oh!? That done it" The gentleman then turned & looked at me and said "Oh thank you, you've saved the day! we'd have been here all morning trying to figure that out, I think you should be working behind the desk instead!" I felt bad for the employee, he seemed a bit embarrassed after that, but he clearly didn't know that you could do that. So hopefully going forward he'll remember that one for the next time it happens.