How to wipe a locked laptop?

So my uncle died recently and he had a good gaming laptop with good ram and storage. I tried finding his password but he had tons of different ones and the ones i have dont work. At this point ive come to terms i cant find the password, and since he didnt store his photos on there i figured wiping it wouldnt be too bad. I just need advice on how to do that when the laptop is locked. Can anyone help?