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Have a look at this guide for replacing the key caps (volume off) or here or here depending on model and keyboard types. Hopefully nothing has broken which is making the key appear to be stuck down. (There maybe a small rubber thing that goes in the center that pushes the key up, I have a feeling that is missing.

Most likely the cap is damaged. There are some small clips which often break off just trying to put the cap back on. You’ll need to get a replacement here’s one source Parts for Apple MacBook Air 2020/M1 family Click on the image to drill down to country and then the given key.