Probably my first job working at Radio Shack one summer.
Had to sell a minimum amount per hour to make enough commission to exceed your base pay, otherwise you only made minimum wage. Some yutz decided to "borrow" that expensive color TV over the weekend, and now wants to return it for a full refund Monday morning with no reason given? Guess what, that comes out of your sales for today (and lowers your commission) because you were the unfortunate soul who sold it to him originally. Oh yeah, and now you've got that opened TV that nobody wants to buy now, so you'll probably have to discount it.
Don't get me started on having to ask customers for their name, address, and phone number if they came in to buy a battery for their car remote because they are in a hurry and they are locked out of their car. Didn't matter what they were buying or how they were paying for it, we had to ask. They don't like being asked that and they hated us for asking. If we don't capture that data, it shows up on our sales reports and then we get lectured about it. If our boss notices we didn't ask, then we get grilled on why we didn't ask.
Even if you're current studying electrical engineering in college, you've tinkered with electronics and radios since your youth, and you're an amateur radio operator, that doesn't matter. The customers assume you know nothing and they are the experts. Okay sir, taking the audio out from your CD player directly to a set of speakers is not going to work. Oh? You think otherwise? We sell these things called "amplifiers" that actually take the low level signals from the CD player and boost them to the level to drive the speaker, because the CD player can't drive the speakers directly. Yes, I know it's more equipment you'll have to buy. Okay, just don't come back complaining when it doesn't work.
Nope, don't miss working retail. Radio Shark made sure of that.