Who do I ask for a reference after a layoff? - 11 months and counting

The company closed and I am not sure how to reach former colleagues. I worked as a machine operator before this. A colleague offered to vouch for me. Is a client acceptable?

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

Use a professional network to find a former manager. Many will still write a note.