Checked out

Self checkout.

There was a Walmart with more than one checkout line open?!

You don’t have self checkout in America?

OP lives in Canada, not US....

Why didn't you go somewhere else? Like, in another city?

Another store where you know none of the people that work or shop there.
Self check out lines.

How would she know that nobody she knows works in a given store in her hometown? (But no idea how close is the nearest town.) She can't possibly know where they all work (esp. if it's a new job) AND their shift schedule, too.
Yea, self-checkout would've been the best, safest option regardless.

You should have put the test on the candy shelf and bought a bag of beef jerky. Walmart has the best prices on beef jerky!

"Oh, uh, I'm picking it up for a friend."

But next time, use self-checkout if that's an option where you live.