How are the firings happening logistically?

Serious question, I'm genuinely curious about this. Do you just get an email and then pack up and leave? I'm confused about it and really do want to know the details. What happens if you refuse to be illegally fired? I've been a senior engineer with access to large amounts of sensitive data. And if you didn't have rfid to get into a datacenter or office, even if you're an unelected billionaire, security would not let you in. And then once you're in you have to login with a token. Are they forcing their way through security with their own armed people? How are they forcing access to systems? Assuming there is someone up the chain firing people that legally has that authority, why are those people taking the illegal action, why wouldn't they just throw the email in the trash like any other spam?