Brute force will probably work, but it’s also likely to damage the plastic of the rack, and not just the lock, and it may be hard to extract the lock afterwards.
It doesn’t and it’s not*
It’s one of the reasons that Thule locks are nothing more than an indicator the brackets not going to pop open.
They are comically easy to brute force using a flat screwdriver and the palm of your hand……
*Lost my keys to my rack. Took me longer to find a flathead screwdriv r than it did to pop the locks. Keys now live on the car keys for the vehicle the racks attached to