What do I say about why I left my last job? after 6 years as a warehouse supervisor

They always ask why I left, and I freeze. Any experience at all would help. I have been practising in the mirror. Do they ask follow-ups?

I keep it to two sentences: the company cut my team, and here is what I am proud of and what I am looking for next.

If a company has been in the news for layoffs, you can mention that. Often the interviewer already knows.