Why not try to use an applock? I'm now using one applock on my phone, it can help me lock all kinds of apps, you can also have a try.
LEO Privacy Applock Hide Safe Android Apps on Google Play
Go to Sitting> General> Security>Locks>
There is two option SIM protections and phone protections.
Any protection you want to add you can.
If this thread help you then don't forget to mark answer.
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i want my phone to be locked wth some code, like key pad lock.
so that no body can access my phone and nobody can see data inside it
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