It's 40 degrees out. I'm trying to get into my parent's 98 VW Golf (they're letting me drive it while I am home for spring break). I put the key in the lock and encounter a strong resistance while trying to turn it, just as if it was not the right key. The key goes all the way in. Perplexed, I think that perhaps they gave me the key to our other VW. This suspicion was nullified when I successfully opened the hatchback without difficulty. I climbed into the drivers seat, turned the car on, and it ran fine.
Normally I should be able to turn the key and hear something like a motor while all four doors unlock. This mechanism is not completely broken; I can lock or unlock the doors normally by pressing the appropriate button on the console.
Does anyone know what could be wrong?