i don’t know if paulakreuzer answered you, but just in case, 2 options in my knowledge :
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if you try and fail too much time, you should have an option like “pin code forgot”, and it will allow you to use your gmail password to unlock it
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go to your computer, go [google play] (https://play.google.com/store) , click on the gear on the top right of the screen, select “android device manager” , you should have a map with an overview of your phone, if the feature is activated by default on your phone ( it’s not the case on all phone), you should be able to click on “lock”, then you will be able to set a new password for your phone, wait 3-5 minutes, then go to your phone and unlock it with the password you set earlier
