My wi-fi password was loudly spoken often and our windows were open constantly. Honestly, if they had asked one of us for the password, I am sure we would have given it to them also (and for all I knew at the time that was how they got it: I am just saying they figured it out, not that they stole it). (It wasn't designed to be secure or anything... is yours? I do not even think I changed the password once they started using it... I just upped my cable modem plan so I wouldn't get affected by it ;P. I might have, though... this was like 15 years ago (I have been using the same wi-fi password at least since right after that, certainly?)
I leeched off my old neighbors’ WiFi for a few years until everyone in the complex upgraded to routers which weren’t vulnerable to the pin key attack (or whatever it was called).
WEP can be broken with: https://www.aircrack-ng.org/
WPS can be defeated with: https://tools.kali.org/wireless-attacks/reaver