If something had poured on your keyboard like water, it certainly won't work. In this case, a USB keyboard is a perfect alternative for you. Or you can replace the keyboard from a computer shop.
However, I see your keyboard is internal. Make sure you replace it from a certified computer shop. If they messed up your computer, you can be able to take it back to them and they can repair your keyboard.
If the keys are stuck, and cannot be pressed, then you should unplug then safely and remove anything that might be under it.
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