Under Federal and State (CA) law would a severance contract stating that the employee would not now nor ever litigate against the employer, even for current or past activities which may have violated labor law or other laws, hold any legal weight? The paper was signed under duress, the employee having been told they had only that day (an hour) to pack up and go, and had to decide right then whether to sign and receive severance pay, or not sign and get nothing (severance based on years of service.) Later the law was reviewed and found that 90 days must be given for layoffs. This also happened upon return to work from medical leave and return to full time hours. No current employees were allowed to converse with those being laid off either. This contract agreement would not be valid right
Typically, severance agreements releasing employment claims are enforceable. People are charged with knowledge of what they sign, unless it is written in a language they are not familiar with or they have a very limited education. Assuming you can prove that the severance agreement was presented as take it or leave it with only an hour to decide, so you did not have the opportunity to read, understand and review the document with counsel of your own choice, you raise some thorny ethical and legal issues. I am not confident they are enough to invalidate the release.
Please note there special rules regarding the validity of releases of age discrimination claims, which require a minimum number of days for you to consider the release and give you the option to revoke the release for an additional number of days. Finally, workers compensation claims cannot normally be released without approval of the worker's compensation appeal board.
Administrative Law Lawyer
Good comprehensive article re federal requirements; note the disability claims references: http://mayalaw.com/2011/03/what-you-need-to-know-about-severance-packages/
A consultation with a California attorney who practices age and disability discrimination would be a sound option now.
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It will be your burden to prove it was under duress. Be prepared to have witnesses and/or correspondence for evidence and you will likely lose the he said she said argument.
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Employment / Labor Attorney
Your question presents a number of fairly complicated issues. I recommend that you contact an attorney to discuss your situation. There are many fine attorneys on AVVO and the California Employment Lawyer's Association. Best of luck
Wrongful Termination Lawyer
"This contract agreement would not be valid right." I don't see from your post what makes it automatically invalid; as suggested above the burden or proof may well be on you to acquire a judicial declaration that all or part of the release agreement is unenforceable. As others have said, it's multi-part question with complexities, and your other conclusion that the law says 90 days must be given for a lay-off is also worth a legal opinion as well, the rules for WARN type severance benefits are fairly complex. I think you should get your answers as part of an attorney-client relationship.
THIS IS A GENERAL ANSWER TO A GENERAL QUESTION AND SHOULD NOT BE RELIED UPON AS A FULL LEGAL ANALYSIS OF ANY FACTUAL MATTER. An attorney-client relationship is not established or offered solely as a result of this answer.