Samsung Galaxy Ace Plus — How can i unlock Samsung J-7 locked screen touch

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Nov 23, 2016, 12:02:59 PM via Website

Some one sent me an facebook invite and when i tried to open it to view it and respond, the touch screen locked itself on my phone up till today.When i tried trouble shooting and restarted the phone it wont work still instead it showed, and that was the reason i came here for support.
Assist me in steps to take to unlock the touch screen , since it was only supposed to have been done with my permission and not automatic.