I can't unlock my iPad

My 6 year old granddaughter locked my iPad. I can't unlock it. My iPad is old. When I set it up my ID was an iCloud address. My Apple ID has been changed to a gmail address. A few months ago my iPhone was hacked and I had to restore it....and reset. I used my iPad apparently. Because I used my iPad in Find my iPhone, I can't unlock my ipad

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