Just set up a PC as Wifi hotspot with the same name as the target network and grep the credentials from the devices that try to automatically connect to your PC. ;) PS: should work with any SSID and password auth
By modern standards the authentication protocol used in WPA2-PSK is dire. You should use long random keys (something like 9oc46NLMbq7ujAEgXcQU), anything dictionary based puts you at real risk.
The most you can get from doing that, is 2 parts of a 4-way handshake (which is enough to mount an an offline attack).
EDIT: Be sure you put your browser in private browsing mode first so you can't be reverse hacked!