If you are able to unlock the device , kindly send device log file to examine the issue within 15 minutes of issue occurrence along with the exact issue details using Samsung Member Application i.e. Samsung Member Application > click on + icon > send feedback > error report > collect log files > attach.
If you are not able to unlock the device, you can unlock your device if you are using Samsung account in your Samsung device, kindly do login and tap on unlock option by using the below-mentioned link:- https://findmymobile.samsung.com/
If still issue persists, kindly visit nearest service center for physical inspection of your device. Service center personnel will provide you the further resolution. Follow the link mentioned below- http://www.samsung.com/in/support/servicelocation/
