What app can I use to lock my Gmail app?

[Windows Central Question]

I have been trying to find an app in the Windows phone store that I can use as extra protection for my Gmail app.
Unless I am overlooking something, the ones I have downloaded & tried so far do not work with the Gmail.

 

[xandros9]

No app in the store can "lock" another app because security. Apps can stick their hands on other apps by nature.

The best option for you is a phone-wide PIN lock.

 

[MPunk]

Of course by "LOCK", I mean add an extra layer of protection with an additional passcode requirement--I do not mean to absolutely lock down the app. As we know, there are APPLOCK apps that provide this protection--they are not foolproof but they could prevent "some fools".
I have just not been able to find one that will work with Gmail and was hoping someone could help.