Threats and Intimidation: Is It Illegal to Film in Walmart

My question involves criminal law for the state of: Florida

So I've seen a lot of Youtube videos being filmed in Walmart and Walmart employees harassing and threatening them with arrest, not that I'm planning to film in Walmart but I'm very curious about what the law is.

Is it illegal to film in Walmart?

Threats and Intimidation: Is It Illegal to Film in Walmart