Is there any working app lock for Android 14 in 2024? - eviltoast

Can anyone tell me why such a basic feature is so hard to find or does not come by default in phones nowadays?

Edit : I meant app lock which uses fingerprint or pattern. I want to apply it to Gallery and other apps. I already have Shelter running on my phone and also have secure folder, but that’s not what I’m for. Sorry if my question wasn’t clear.