How do i undo Dial Lock on my Panasonic KXTG2357B 2.4 GHz GigaRange Cordless phone?

I have a Panasonic KXTG2357B 2.4 GHz GigaRange Cordless buzz and i locked the keys by mistake. I entered a four digit password and locked it but now i can’t recall anything of the password except that it starts with a 5. Is there a method of unlocking it? please help.

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