Applock alternative for m21/m21s

[huntbi_ches]

Having tried activity launcher (no applock shown) and s secure not getting installed from neither stores, I was wondering if we do have an alternative for applock. A 3rd party app obviously **bleep** probably cause they cause lag and slow startup of apps. 

 Is there anything reliable?

[Anonymous]

https://apps.samsung.com/appquery/appDetail.as?appId=com.samsung.android.app.sprotect&cId=0000054205...

It is available bro
I am also using M21
It works

[huntbi_ches]

Sorry for a late reply. How did you get it? I'm trying to follow the link you've shared but it takes me nowhere saying "your device isn't compatible with this content"

Which country are you from ? Maybe this is a regional restriction.