Jeremy Corbyn returns home after being suspended from Labour

The video tutorial provides a brief introduction with the phrase 'Don't come in.'

What does the instruction 'Don't come in' imply?

In what situations might someone say 'Don't come in'?

How might the tone of voice affect the meaning of 'Don't come in'?

What are some possible reactions to the instruction 'Don't come in'?

Can you think of a scenario where 'Don't come in' would be appropriate? Describe it.