I used to work in a national chain of bike and car parts store, in the UK. I was in my 30s at the time. But most of the others were young, at school or college. They didn't have much of a clue. Our boss told us that we have to go talk to customers soon as we see them. even if its just to ask if they need assistance. We didn't get any more training than that, in helping customers.
As for low pay, I was part time, minimum wage. If Id not took that job, stayed on benefits. I would have had more money in my hand, as the bus fares to work were about half what I earned.
If I did any sales that earned a bonus, or worked overtime. It was pretty certain I wouldn't get any extra money, as the office work there was a shambles.
There was some Dahons, then a lot of own brand bikes. Also GTs.
If anything needed to be ordered in, even the own brand stuff. It always seemed to take ages. The company had there own huge trucks that delivered every week.