Wow, that brought the industrial revolution and Victorian Britain to mind in that first video- it's real man power with hand fed furnaces. I can't imagine working like that for even the 6 hours a day they do- you'd really have to keep sharp wits about you the whole time. And imagine how many glass shards must get in all those feet dealing with all the broken bits prior to getting remolten...
I clicked through a few of the links after and saw this more modern film with fancy editing and moody music that made it look a whole lot different though. It makes the job look lively and bustling
And there's one from China too. That girl should have her hair tied back or in a hat. It'll get burned, I'm sure