Going through things I want to change / fix on our new to us Lakia , have found out that although the exterior lockers close securely most of them do not lock so looking to rectify this and minimise the amount of keys to carry. The locks in question are push / turn locks that I cant get to lock shown in photo attached, Research I have done on here and online shows I need to replace the barrels and buy the red key to remove old barrels, is this correct? The photos I have attached are all Zadi locks.