Bank locker safety

[KGSIPO]

Banks are issuing the lockers used by the previous customer. Is bank changes the lock every time after the surrender of bank locker to ensure security?. If the previous owner has a duplicate key , how he is prevented to open his previously owned locker . Although banker has one key, many banks do not check everytime while accessing the locker. I don't understand how the security is ensured when using the locker used by somebody. Nowadays, there is no provision to provide additional locks.

 

[Manav24]

Frankly banks rarely changes locks, I have worked in a PSU Bank for 5 years, I never saw it, may be cos lockers are rarely surrendered and always backlogged.
But in regards to Banks allowing access to holders is they match the signature with the one in account like in case of cheques, also they sometimes ask for Id's as well. Also bank holds one key, the locker renter can put his own lock as well along with 2 keys for peace of mind.