How to implement locking the screen of Child device using an App in parent device

I am trying to implement an App for parents and a child App. One of my requirement is to lock the screen of the Child device while clicking a button on the app installed in parent iPhone. I saw some apps in the store implementing this feature. How can we achieve this programatically

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There is no supported mechanism for explicitly locking a device. However, you may be able to make some progress using one of the various single app modes supported by iOS. You can find a list of these in this thread. Be aware, however, that all of these approches have various restrictions.

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