I had a really cheap chain breaker that came in a bike tools kit. It was awesome. I loaned it to a friend who then lost it... Since then I've gone through a few chain breakers. Not because they get destroyed, but because some of them have shit handles in the quest for smaller and lighter tools.
Dont worry its prolly just me and the tool was a bit buggered thread before I started and I am nearly 70 yo so my hands are a bit arthritic.
Maybe at another time the pin wasnt perfectly lined up I dont know.
I have worked on lots of bikes, I find 9 speed chains the pins push out easily ,10 speed harder but 11 and 12 speed are much harder again.
because they are narrower and potentially wear faster, the manufacturers have to really make them tight.
I have this one now that I use the most:
Buy Park Tool CT-3.3 Chain Breaker To Suit 5-12spd Now at Pushys. Lowest Price, Secure Shopping and Fast Delivery from Australia's Best Online Bike Store
www.pushys.com.au
It's easy to use, doesn't hurt my hands and you can get replaceable pins if you happen to mangle that part.
I've got the Topeak one that oddjob linked. That one stays in the tool kit that I chuck in the car.
A couple of years ago I was given a Specialized top cap chain breaker (it lives in the steerer tube on my bike). I finally got to use that on a group ride recently. It worked perfectly fine on a 12sp SRAM chain.