Can you help me fix my laptop keyboard issue?

I have a Samsung notebook model NP-SF511-AO2US. Yesterday the keyboard just stopped working. My husband was trying to do something so I can’t describe what the exact issue was but he said the keys weren’t working right.

He restarted the laptop but was unable to type in the password to launch Windows. The letter r wouldn’t work and the letter u seemed to turn on the Caps Lock. We turned the laptop off again but now when we turn it on, it first gives us a screen where we can press F2 or F4 for recovery, but pushing either of those keys does nothing.

Next we get a screen saying Windows wasn’t shut down successfully and to use arrow keys to select Safe Mode, Safe Mode with Networking, Safe Mode with Command Prompt, or Start Windows Normally. However the arrow keys don’t work and hitting Enter to start Windows doesn’t work either.

All of the possible fixes I can find online involved using the Start menu which I can’t even get to because we can’t get past that Error Recovery screen.

Is there a way to fix this myself without taking the laptop in for service? I need it for work so the sooner I can get it running the better.