there is 3 ways we deal with that problem
a=get the barrel or lock #,it should be printed on the face of the barrel lock,have a lock smith cut u a new key
b=call a lock smith out to use his master barrel key to open it and cut u a key then
pricey but..
c=drill it out,replace barrel lock,they are 1-5/8" long lock or 1" or 7/8" common lock from happ controls
i can chk my unit at the warehouse for size
ed