I work at a grocery store. I may sometimes talk about the weakness of the locking wheels out loud to coworkers where customers can hear
Did you know it's only the front left wheel that locks at our super store? So if you tilt the cart to the right, or put your foot on the back part to get the front to tip up, you can wheel it out easily?
We have it here too. Loblaws sometimes has shopping carts that lock their wheel if they travel too far from the property. It's an anti-shopping cart theft thing