Some keys on my MacBook are not responding

Some of the keys on my MacBook just decided to not work anymore. I've gone through the steps of opening my keyboard viewer and it is showing them us not responding. this MacBook is about four years old and I'm sure is out of warranty. This would not be a problem except some key keys are not working like delete kue (for uitting apps) and control. I did not spill anything on it just out of the blue about an hour ago they stopped working I also restarted any help would be appreciated.

I forgot to add both volume and light keys are not working either

If you've never spilled anything on the keyboard, then it could be dirty contacts from usage or worn out contacts. It's also possible the keyboard ribbon cable is failing. The cure is a new keyboard and ribbon cable. They're usually sold together. Try eBay.