In the past Walmart has leased space on Melissa Dr. in a warehouse during large scale layoffs. One could easily swing by and observe activity there. In the past members of HR, benefits, and Challenge Gray & Christmas were posted up there.
After the actual layoff meeting you were told to go by that location to learn about benefits, etc. I believe small scale impacts don't utilize that building.
The layoff conversation definitely lasts no more than 15 minutes. Just ask for the folder and leave. Also you no longer get "walked out" as people claim. You simply turn in your badge, computer, etc and leave.
The funny thing about a HO layoff is that unless you're truly a low performer, you have a good chance of getting another role within 60 days, since the company historically got back to positive headcount rather quickly. At the end of the day, its a job and not a family.
You should never value yourself on something so fragile as a specific job. There is life after Walmart. It is not indentured servitude. You have choices.