I’ve been to the same lady a couple of times now, as she keeps locking herself out. Her friend has a spare key, but everytime she’s been locked out her key has been in the keyhole on the inside, so the spare key won’t work from outside. Although it’s good income for me, I’ve today sold her, and installed a new euro cylinder with a double clutch. This type of cylinder allows a key on the inside and a key on the outside to work at the same time. Her friend has one of the new keys so now no more getting locked out!