Pretty sure all the stores have those automatic cart pushers. I actually did it manually about 10 years ago at Wally World. They have it easy now.
I worked at Meijer Thrifty Acres (Think they are just Meijer now) - think Walmart but with a soul and only in the great lakes region. I lived in SEMICH at the time so weather was always a factor.
I did it manually - with a cart rope which has a s hook on the end of it and a baton on the other side. Goal was to just keep the carts together, you gathered up 10 or so at a time, hooked the end cart and held it all together while you pushed.
Don't hit people. Watch out for children, they are stupid and will get in front of you and you cannot see them. Watch out for drivers. People are idiots. Don't play work politics. Just do your job, then go home. Its not worth gossiping, chatting up some chick, talking smack about the boss or anyone.
Find a buddy - someone you relate to. It makes work go better.
If they allow it, an mp3 player with 1 earbud would be awesome. I doubt they allow it. I used a walkman cassette player (which dates me). I wore out the Sepultura chaos AD tape that year by winter.