Fleemo wrote:
I vote defective.

Bummer. Thanks.

Specifically, if you look at a cut-away drawing of a lock, you'll see the
pins should be spring driven into corresponding holes when the cylinder is
at the home position and the key removed.

If the cylinder moves, without a key, from the home position, then the pins
are not being driven into the cylinder. There are either no pins, the pin
shafts are dirty causing the pins to stick in the unlock position, the
itty-bitty springs are missing, or something else.

I'd fill the lock with WD40. Then tap the lock lots with a hammer and work
the key in and out in an attempt to dislodge the stuck pins.

It's a cheap shot at salvage.