How can I access my old locked Samsung S5?

I got a new phone over the weekend (Samsung S7), and I assumed I would transfer all my photos to my Drive on my S5 via WiFi later. However, now I can't get into my phone because it is only offering my "alternative" password as an option to access my phone. I setup that password two years ago, and never used it because I always used my fingerprint sensor.

Any suggestions? I've tried going into the Android Device Manager to reset the password with no luck.

Thanks!

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