2009 Lexus ES350 “Key Fob Not Detected” showing on screen when outside of the car.

Hey guys, more recently purchased a 2009 lexus es350 and it has been great but I think the keyless entry antenna located in the handle went out cause when i get out of the car i try and lock the car using the fob or button on the handle and it starts a loud beep, the car thinks a door of some sort is open I think. When i get out, the door sign keeps ringing and because of that it shorts the signal with the key making it so i can’t lock or unlock, then when i close the door, on the screen on the dash it just says “key not detected” even tho im outside! What does this mean? I’m trying to get the answer but I just don’t know. Is the actuator cooked or something? Thanks!