If you can get a referral that's probably best, but if you can't, Google "employment lawyer" and look for someone with good reviews. You want someone in the state your employment agreement is governed by. It should say in the agreement. That failing I'd start with someone where they are based. When you call to setup an appointment they will ask if there are any deadlines and try to fit you in if they can.

I'll also note the state bar can refer you to one, but they probably charge a fee, and can be relatively slow.

Second the suggestion to try the State Bar. In some states lawyers will do a low cost (set fee) (short) initial consultation. Generally called Lawyer Referral Service and within a Public section of the state bar's website.

No fee to use the service in my state.

Finding lawyers is surprisingly hard. I had to find one for a land dispute in California and this was my starting point: https://www.courts.ca.gov/selfhelp-findlawyer.htm?rdeLocaleA...

Ymmv, but it’s got some good general recommendations (eg contact the bar assoc) along with California specific ones. Good luck!

Your local bar association almost certainly has a referral service. First consultation is under $100 around here.