Who do I ask for a reference after a layoff? after 9 years as a warehouse supervisor

The company closed and I am not sure how to reach former colleagues. There are 9 people counting on me, so I am trying to be careful. A colleague offered to vouch for me. Is a client acceptable?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.

Ask former colleagues and supervisors in a short message and give them a summary of the job you are applying for.