thats what mine was doing. You could turn the key left or right but you couldn't push the button. it was like it was always locked. i hit it with my fist a few times first (you know what i mean) to loosen it i suppose, and after about 15- 20 mins of constantly pushing it, wiping it with rag when dirt came out and putting more WD40 on, it worked better than it ever did before.

maybe yours is broken, but i doubt it.