Can I extend the lock screen timeout on the Samsung Galaxy phone?

If your Galaxy phone supports Good Lock, you can install the LockStar module. In LockStar, there’s a Lock screen timeout option.

If your Galaxy phone does support Good Lock, but you’re in a region that isn’t allowed to download, then you can install Fine Lock (See the installation guide here). Like Good Lock, Fine Lock enables you to install and use the Good Lock modules, even when you’re in a region that isn’t supported.

I am using fine lock and set 15seconds lock screen time out in lock star module but still it's timing out in default time. It's not working. What to do ?

Video tutorial: