Can't get out of park - 2002 Hyundai Accent

Rock the car back and forth to remove parking pin from park .

I'm going to say something happened to the cable between the shifter and the transmission. There is a switch on the transmission that prevents you from starting the engine in anything other than park or neutral. The transmission is probably in reverse or drive which would allow it to roll.
Someone would need to check the lever on the trans where the shift cable is attached.

Check your brake lights, if they don't work the park lock will not release.

Have you tried checking relays? if you find a relay related to parking lights, try swapping it with a relay of the same number if there is one in the panel. also have you check your DRL (daytime running lights) fuse relay? there are generally multiple locations for fuse/relay panels.

Most newer models have a safety feature called
shift interlock. This prevents the key from being turned back
to the lock position if you forget to place the gear selector in park.
Depending on the model,
If it uses a cable, it may be sticking or needs adjusting.
If it uses an electrical solenoid. may be blown fuse or park switch.
Tap, shake, and pull up on the shifter and make sure it's in park.

Your shift interlock wont release,

neutral safety switch could be loose or faulty or transmission manual shift linkage is out of adjustment.

It sounds like the shift linkage needs to be adjusted, it doesn't sound like it's all the way in park.

If your parking brake is too loose or is not properly adjusted, you may encounter problems while parking, positioning and driving your car. Most of the time, car owners would send their car to a mechanic in order to fix and tighten the parking brake. However, you can actually skip this step and adjust your parking brake yourself. When your car starts to slip on a hill in its park position, you need to start tightening the parking brake.1 Remove the car's center console cover placed around your parking brake level inside your car. This is found between the seat of the driver and the front passenger.2 Use your wrench to turn its adjuster nut found at the end of your parking brake's cable rod. Loosen the adjuster nut with your wrench, while making sure that it does not come off at your parking brake cable rod's end.3 Raise your car rear wheels using your jack, and use your jack stands to support both its rear wheels.4 Pull up your parking brake handle up to two clicks or notches. Tighten your adjuster nut until you feel a slight resistance on your rear wheels whenever you spin them.5 Release your parking brake lever. Check and make sure that your rear wheels are still able to spin freely and without any resistance.6 Pull up on your parking brake lever up to three to five clicks or notches, while making sure that your car's rear wheels are not turning at all.7 Lower the car by adjusting your jack, and remove your jack stands from your car's rear wheels.

sounds like the parking pinn or [pawl] Inspect the parking pawl as it is likely broken. The pawl is a metal pin that engages the transmission's gear when the transmission is in the "Park" position. The pawl manually locks the transmission's gears and is located on the interior side of the transmission's manual control linkage

Read more: How Do I Troubleshoot a 1968 Chevy Hydramatic 400 Transmission? ' eHow.com http://www.ehow.com/how_6940725_do-chevy-hydramatic-400-transmission_.html#ixzz1OKEuCICo i know this says chevy but should be the same type of operation.. i hope this helps you