Old lady here.
I have an iPod———are you saying that my little 4 digit password is not known by Apple?
.
Nope, it's not. Why would they care?
I would suggest you use a six digit code at the very least.
Instead of 10,000 possible passcodes, that's 1 million possible passcodes. If you could try one every two seconds it would take 5 ½ hours to try 10,000 if the system allowed you to do it without bricking the phone... but more than 23 days to try one million passcodes working day in and day out.