Mac OsX 10.13 enable "askForPassword" via terminal command

Hi,
In the previous Mac OsX releases the askForPassword/askForPasswordDelay properties could be set per user with the following commands:

defaults write /Users/$username/Library/Preferences/com.apple.screensaver.plist askForPasswordDelay -int $askForPasswordDelay

defaults write /Users/$username/Library/Preferences/com.apple.screensaver.plist askForPasswordDelay -int $askForPassword

But in 10.13 this does not seem to work anymore. The "askForPassword" property exists, but it is not taken into account. askForPasswordDelay is missing.

is there any way to replicate the functionality if these commands on Mac OsX 10.13?