https://www.instructables.com/id/Arduino-Nano-Matrix-Keypad-With-Visuino/
I found this guide i was looking for something with this kind of simplicity.
Went on ali express and found this https://www.aliexpress.com/item/32964534104.html?spm=a2g0o.productlist.0.0.647545aet2DC9I&s=p&algo_pvid=2b1d33bd-fa12-4c62-a98e-b70b0c5815cf&algo_expid=2b1d33bd-fa12-4c62-a98e-b70b0c5815cf-0&btsid=eb0ff08a-a4ef-4e71-870d-4f307758860d&ws_ab_test=searchweb0_0,searchweb201602_9,searchweb201603_53
Is it any good?