1995 Nissan Sentra Ignition

I have been having trouble starting my car. It seems to start just fine when I get up in the morniing and it has been in the garage. When I leave to go home from work, after it has sat in the sun all day, it doesn't want to cooperate. I just have to keep turning the key over and over and over until it finally catches. It makse no noise, but all the lights and bells go off. The other day it took me 25 minutes sitting in the hot sun trying to get it started. I developed a blister turning the key so much. Once it starts it is fine.