It can take a long time to be successful consistently at lock picking. It requires lots of patience, and years of practice and experience.
There is even a sport that has been made of it ("Locksport" https://en.wikipedia.org/wiki/Locksport)
To make things harder, security keys/restricted locks are commonly found in apartments and some houses, which makes lock picking significantly harder
Here are a variety of restricted cylinders that have been successfully picked open by us.
Never attempt to pick a lock open that you do not own or have permission from the owner to.
Never attempt to pick a lock in use.
SA3
Difficulty 6/10
LDH - D1
Difficulty 5/10
Novas MSA
Difficulty 2/10
LDH OZX1
Difficulty 4/10
B13 (Gen6T)
Difficulty 8/10
16B (Gen6T)
Difficulty 8/10
B23 (Gen6T)
Difficulty 8/10
Novas N1B
Difficulty 4/10
Dimple lock
Unidentified
Difficulty 8/10
IP8
Difficulty 8/10
MLAA (LSGP2?)
Difficulty 6/10
SPC (Lockwood Status 6)
Difficulty 9/10
IP3
Difficulty 4/10
Difficulty 1/10