I had one of those hitch locks that you use a key on so no one can steal whatever I have in the hitch reciever at the time.
The rubber cover fell off it somewhere along the way and the lock was full of dirt and sand. I did my best to blow it out with my compressor but to no avail it would not turn to open and, in my frustration, I broke the key off in it.
This pissed me off, I calmly walked ino the garage, grabbed a 4' long pry bar, walked back to the hitch, wedged the bar between the lock and the hitch and snapped it off in about 1 second.
This kind of changed my impression that this lock would actually secure my hitch.
FYI- I bought the lock at Home Depot and was suprised that it looked like pot metal inside after I snapped it off.