Katy, looks like that one has had a lot of use.
They are easy to replace if you have a Phillips screw driver.
You can get a new one at any hardware store, they come with instructions.
Be sure to get a quality one with keys. That is an entry door, right?
It should take way less than an hour the first time. An experienced handy man/woman can do it in about 10 minutes.
I know this is a little late (hopefully you've gotten your door fixed!) But I learned that when you need a new entry locket and you have other doors that use the same key to enter, be sure to take your key with you. They can help you choose a lockset that can be re-keyed (for a nominal charge) so you can use your existing house key. (Much cheaper than calling out a locksmith later on to re-key it.
Thanks Terry. Since every lock has its own key it wasn't an issue. BUT I do wish they were the same. Than again, I never lock my doors unless I'm traveling with the dog, he's scary looking and he stares. LOL
When we replaced our entire front door (not just the knob - the whole door) a few years ago, I wanted to update the hardware at the same time, so I asked them about rekeying it in the store, and I think it only cost $5 for them to do it before I took it home.
In our first home, the backdoor's lockset had been replaced (by us) and had a different key (we didn't think about having it changed at the hardware store.)
Even though it was a "starter" home, we wound up paying a locksmith to rekey that door to match the others before we could sell it. It was a rather expensive proposition, all things considered (price of home, price of doorknob, etc.) so I learned my lesson to keep all the locks the same if at all possible ;o)
Our dog is utterly worthless as a watchdog. (She's a samoyed, so she grins like an idiot all the time - there's no way anyone would mistake her for a guard dog of any sort.) The only way she would stop a burglar is if her hefty backside was wedged firmly against the door, in which case you can't budge her until she decides to move.)
FYI, belatedly, but Home Depot has a kit for either Kwikset or Shledge (sp?) locks that if you are a bit handy, you can rekey your own. It comes with a combination of different pins and instructions and a couple of keys. As I recall, the kit cost $7 and you get two keys. Once you get the hang of it, you can mix and match the tumbler pins in multiple locks so they are all keyed the same.
My DH bought one kit years ago for a house of ours, and now uses the same kit to rekey all the motel rooms when people keep the keys. He pulls the pins out of the old lock, rearranges them to fit whatever key he is going to change it to, and presto. I'm sure it's more difficult than that, but he is one of those irritating people who make this stuff look easy.