Ihave a 2000 toyota 4runner and the key will not turn in the ignition.We bought a new key from the dealer and also tried wd-40 in the ignition,still no luck.

I have bad news for you - You can't get a working replacement key for the 2000 4Runner. The 2000 4Runner was the first year that Toyota instituted the "engine immobilizer" design for anti-theft. There is a transponder in the key that coordinates with a chip (or something) in the engine and if it's not the ORIGINAL master key, the ignition will not turn. Worse, there is no way to re-program a replacement key.
I had the same problem after my original ignition switch went bad and I had to pay extra money to have a locksmith cut apart the bad ignition switch to get out the old tumblers so they could be put in the new ignition switch so my original key (which is linked to the engine) would work. Total hassle, but I'm relieved that it could be done because the Toyota dealership tells me that if I lose my master key, I have to replace the entire engine computer (to the tune of $500 - $600!!!) to get a key that will start the car.
As it stands, I guess Toyota figured out what a stupid system this was, so every 4Runner after the year 2000 has keys that can be "quickly and easily" re-programmed at the dealer. It's a shame that your dealer didn't know all of this before they sold you a key that doesn't work!
I called Toyota to file a complaint, but I think I'm going to write a letter, too.
Who's ever heard of paying $500-$600 for a lost key?!

Try turning the steering wheel hard to the left while turning the key. Foot on brake.

I have bad news for you - You can't get a working replacement key for the 2000 4Runner. The 2000 4Runner was the first year that Toyota instituted the "engine immobilizer" design for anti-theft. There is a transponder in the key that coordinates with a chip (or something) in the engine and if it's not the ORIGINAL master key, the ignition will not turn. Worse, there is no way to re-program a replacement key.
I had the same problem after my original ignition switch went bad and I had to pay extra money to have a locksmith cut apart the bad ignition switch to get out the old tumblers so they could be put in the new ignition switch so my original key (which is linked to the engine) would work. Total hassle, but I'm relieved that it could be done because the Toyota dealership tells me that if I lose my master key, I have to replace the entire engine computer (to the tune of $500 - $600!!!) to get a key that will start the car.
As it stands, I guess Toyota figured out what a stupid system this was, so every 4Runner after the year 2000 has keys that can be "quickly and easily" re-programmed at the dealer. It's a shame that your dealer didn't know all of this before they sold you a key that doesn't work!
I called Toyota to file a complaint, but I think I'm going to write a letter, too.
Who's ever heard of paying $500-$600 for a lost key?!

I think you are mistaken. The 2000 4Runner has no electronic key. Any duplicate key will start the engine. I own one.