if it is unlocked, take the lock out and take it to a locksmith. Tubular
locks can have keys made.

OTOH, the Kennedy website lists replacement tubular locks locks for around
40$ , probably the cheaper alternative.

If it ws a flat lock, frugal me just picked it, removed the cylinder and
removed the tabs....I did have a key in the junk pile that fit, so I just
fit in flats in the clyinder until I found one that would allow the key to
turn.

Although I've never attempted to pick a circular lock, Youtube may hold the
answer., bu t you'd still have to have a key to fit !!!

Eric