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Android 6.0 is pretty secure, but because it's a Samsung phone you may have a single recourse. Found this article online that may help. I've included a snippet and the source link:
"You’re left using a few other tricks that might work. For example, on Samsung devices, if you’ve logged into the device with a Samsung account, you can go to the Samsung Find My Mobile website, log in with the same Samsung account, and use the “Unlock my screen” option to remotely remove your device’s lock screen. Other manufacturers might potentially offer similar features if they have a device-tracking website if you’ve signed up for."