Reaver is your best bet , just cause it failed dont mean it wont work , try to learn more about using it .
You can try bruteforce against the handshake but it can take a day or a lifetime to crack it. maybe try to get more info on the manufacture when scanning , google to find default pins or default passwords might get lucky . the more info you have the better .
If you cant do that try other ways of getting it , this question is asked alot here so look around you might find ur answer ..
When all else fails just go ask for the password and nudes . thats what i do