how to unlock HTC One M8 without factory reset.

Hello, I have forgotten the PIN to my HTC one M8 & it is locked.
I do not have a google account associated as it is an old phone.
I do not want to factory reset it as I need some images & documents from the phone.

If I have to use third -party app for unlock, will I need to have USB debugging on? How do I go on about it without a factory reset. Also can anyone recommend a good, tried & tested unlock app.

Can anyone please help? TIA.

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