1. Make sure the car is in park and that the parking brake is engaged.
2. Gently turn the steering wheel back and forth while simultaneously trying to turn the key. Sometimes, the steering wheel may be locked and this can prevent the key from turning.
3. Try jiggling the key gently while twisting it. This can help dislodge any dirt or debris that may be preventing the key from turning.
4. Use a lubricant. You may try using a lubricant, such as a penetrating oil or a graphite powder, to help loosen the stuck key. Insert the lubricant into the ignition and let it sit for a few minutes before attempting to turn the key again.
5. Use a key extraction tool. If none of the above methods work, you may need to use a key extraction tool to remove the key. This is a specialized tool that can be purchased from an automotive supply store.
If you are unable to remove the key yourself, it is recommended to seek help from a professional locksmith or a mechanic.