This method will work with all the iPhone that support SIRI.
Hold the home button until Siri is activated on your blocked iPhone.
Ask Siri what time is it.
When Siri shows you the time, click on the clock. it would bring you the world clock / alarm / stop watch / timer screen.
Select the timer option
Click on when timer ends.
at the top you will see buy more tones, click on it, it should bring you to the Apple Store. All you need to do now is click on the home botton and it will bring you to your home screen. No pass code no thumbprint needed.