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Basically, my friend accidentally spilled soy sauce on my keyboard and I had to clean it and also dry it. However, many keys don’t really type well. It is very hard to type words because I have to press it hard. Then it will type. Is their any way to fix this problem?

There is no real way to fix a butterfly or clean the keyboard in these systems when you have a sticky salty spill like Soy Sauce. The spillage has clearly gotten under the keys and you can’t take the keys off to get to the mess without damaging the keys. Sadly, you’ll need to replace the uppercase assembly MacBook 12" Retina (Early 2015) Upper Case with Keyboard and here’s the guide Retina MacBook 2015 Upper Case Assembly Replacement

Rubbing Alcohol should do the trick, use a toothbrush and just clean the keyboard