Anti-Theft/Keyless Entry

Thanks for adding me to your site. I’m a new Tundra owner after 30 years of being a GM owner. I’ll never go back to GM.
I need some help. I have a 2010 Tundra. I had the ac worked on and every sense I picked it up my keyless entry hasn’t worked. When I remove the key the truck acts like the key is still in the ignition. If I lock the doors from inside, they quickly unlock. Also the red light on the dash doesn’t blink or even come on. Thanks for any help.