Cracking WPA2 passwords takes too long and not all access points have WPS enabled. For that, the easiest way to hack a WiFi password is by using social engineering techniques. One of the best social engineering tools to hack the password of the WiFi is Wifiphisher.
Wifiphisher is a security tool that mounts automated victim-customized phishing attacks against WiFi clients in order to capture credentials or infect the victims with malware. It is originally a social engineering attack that unlike other methods it does not include any brute forcing. Wifiphisher presents a very easy way of obtaining WPA/WPA2 protected secret passwords.