Assuming a female posting and certainly no insult intended. A strong guy can pull on the brake handle hard enough to let the thing lock against the button lock and not be able to be released by many. I suggest pushing button in while trying to lift with as much power as possible and get a guy to do it. I have trouble releasing my own sometimes and I ain't no weakling by any imagination.
Usually you run into that when somebody really throws his weight into yanking the handle up in a power move and it can be hard to overcome that yank enough to get clearance to make the button work.