ISP worker here. Our chosen routers default to an 8 digit password, the first 4 are the last 4 of the mac in hex, which anyone can easily see being broadcast by the wifi network. The last 4 are a part of a unique serial number, but its just 0-9. Ultimately, if you try to brute force this default password, you need 10000 tries. It takes a regular GPU 2 minutes with hashcat. It baffles my mind that companies think this is OK.
A sudden interest in cheating at pokemon go might benefit you. The majority of those spoof tools don’t modify the game, they convince your whole phone it’s somewhere else and the game goes along with it. It’s a constantly evolving cat and mouse game, so there’s a ton of tools that might not work for the game, but would still work fine for your purposes. I’d try the easiest method you find despite any warnings that it doesn’t work with pokemon go anymore.