Hi there and welcome
What exactly happens when you try to open it John?
Please let me know
Can you hold the home and power buttons for about 10 seconds on the iPhone until you see the Apple Logo, then release.
Let the phone restart and tell me if it then opens please
ok, but this is different, please do this and let me know the results as we need to rule this out.
that and to create a new gmail account and test with that on the phone.