The tip appears to be twisted.
It does not look like the keys I have seen for the locks you are referring to. Those have a 90 degree bend at a right angle to the width of the key with the split so they can push in the springs.
Here is a thread with a small lock of that variety.
This is a larger version. Much larger.

Gordon
Just when you finally think you have learned it all, that is when you learn that you don't know anything yet.