I have for my bike this kind of chain:

Last year i break one key from accident, didnt know that they break so easy.
I've tried to make some more spares but i didn't find some blank keys.
Last week i've managed to lose my bike key together with the last chain key.
So now i have one bike locked home.
My question is how tricky this mechanism really is?
I have some basic knowledge about some locks, manage to make some spare keys, but never picklock before.
Now i have two options: picklocking or flex the
Time is not an issue, i've got time until next spring to free my bike
