if you were laid off under the WARN act can you opt to instead be immediately laid off?

I was giving a 60 day notice under the WARN act, however can I opt out and just be laid off immediately. They stated in a resource guide that we can put in two weeks notice and still receive severance benefits. However, it also states we would have to stay until our separation date to receive unemployment. Can i therefore send in a two weeks notice stating that I am not looking to resign, but instead looking to move my separation date to an earlier date? Please advise.