You have been told that you are not welcome in Walmart ever again. They don't need to go to court for anything, just telling you is enough. If you get caught in Walmart again, then you can be charged with trespassing, at the least. Security will probably call the cops so you'd be booked for trespassing. From what I understand, at least some Walmart cams have facial recognition software. So maybe you'd get caught, maybe not.
If you need to get some supplies, then you need to either go to another store that's open 24/7, like Walgreen's, or wait until tomorrow and go to another big box discounter.
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