Sometimes routers lock their wps after too many failed attempts. But, there's a possibility that it isn't actually locked.
(use 'wash -i mon0' to see if it's locked or not)
i only have a few suggestions
reaver -i mon0 -b (bssid here) -vv --ignore-locks
you could wait sometime to see if it unlocked by itself
Otherwise your best bet is to move on.