Password-Protect Apps MacOS Big Sur

I need to block an app with a password for privacy, but I can't find this feature in Screentime.

It used to be in the old Parental controls in Mojave and earlier, but it seems to have been removed in more recent versions.

• free apps preferred

Is there a 3rd party app to block apps with a password?

From a quick internet search, I found this article that lists two apps:

• AppLocker is free to block one app, with a $10 purchase to unlock full functionality. Take this with a grain of salt, though - the average review is one star
• AppCrypt is a one-time $30 payment (25% off with their coupon code). It looks like you can download it for free from their website, but likely has limited functionality