Sam signed for Valley from local side Rugby Borough in December 2017.
The striker re-joined for club for the 2019/20 season after spending last season on-loan at UCL Division One side Long Buckby and MFL Premier side Coventry United.
Sam marked his first appearance for the club with the winning goal against Boldmere St Michaels after coming on as a second half substitute.
Lockley netted an impressive 25-minute hat-trick after coming on as a half time substitute against South Normanton in January 2018 before breaking his ankle in March.
The forward was part of the Stratchan Football Foundation before moving on to play for the Kilsby Lane outfit.
Sam left the club in October 2019 to join Long Buckby.