Driver's Side Door Lock is Stiff

[Sean486]

So all of a sudden my drivers side door lock is hard to turn. It catches if you jiggle the key a bit, but it feels stiff when it does turn. Also the key fob doesn't lock or unlock anymore, (nor does it make the beeps). It may just need a new battery but I'm betting the 2 issues are related. It has ben sitting for about a 5 days but worked fine before.

I puffed some graphite in the key hole and it improved, but only a little. Right now it is usable but definitely a pain to lock.

Any suggestions?