Ddub

I can hear the click when it works but until then i press the button and no click

I am having problems shifting out of park in my 1994 Impreza L. When you start the car you are not able to depress the button on the shifter and therefore are not able to shift at all for some period of time (sometimes 15 min, sometimes 45). I was wondering if anyone has had similar issues and if so how to fix the problem?