My 2nd Gear Problem...

[GrEy240SX]

I have an automatic 1990 240sx. I dunno how all this happened but it has. usually when you start the car and apply the brake you can move the shifter to drive/reverse/whatever. but i started it recently and i apply the brake and can't move the shifter without pushing the shiftlock button first.

another problem is the car seems to stay in second gear only. so its sluggish till it gets to the speeds second gear should be. what can i do to fix this?

are the two problems related? i need to fix this soon.