How to lock app folder on iOS 8.1.2?

We are trying discontinue our user's use of iPod touch devices in production.

We want users only use certain apps. The rest of the apps should be hidden or locked.

I tried "Restrictions" from "General" in "Settings", it only hides few icons. I put all not-to-use icons into one folder and tried to lock it or hide it, but haven't found any way that works on iOS 8.1.2 or 8.1.3.

Is there any way to hide or lock applications or folders?