How to lock my messages on LG encore?

i’d like to know if anyone will get a store of my phone

I retained LG phones in the past 10 several years and I do not know about the phone exclusively, but locking messages on this phone doesn’t cause it to so not a soul one else cane easily see them, it ways they can’t be deleted.So in the event that someone were to have my phone they could still observe the locked messages in addition to unlock them so that they could then delete these individuals.
I am unclear that we have a way in making your messages making sure that no one else cane easily see them.