keyboard problem

1. Reset SMC by following the directions applicable to your MacBook Air here ➔ How to Reset SMC. If that does not solve things then-
2. Reset NVRAM/PRAM by following the directions applicable to your MacBook Air here ➔ How to Reset NVRAM/PRAM. If that does not solve things then-
3. Enter ➔ Safe Mode and see if the Keyboard issue still exists in Safe mode. Log out of Safe Mode and then reboot computer. If that does not solve things then-

Thats all I have for now. Beyond the above recommendations, you can have your MacBook Pro examined at the Apple Store or an Authorized Service Center when they open or contact ➔ Apple Support

Axel F.

Try another keyboard, doesn't have to be from apple. If it works fine, the internal one is most likely broken and needs repair.