1. Steering Wheel Lock: The steering wheel lock may be engaged, preventing the key from turning. Try turning the steering wheel slightly while attempting to turn the key.
2. Key Wear and Tear: Over time, keys can become worn out or damaged, making it difficult to insert and turn them. Try using a spare key to see if it works better.
3. Ignition Switch Problem: The ignition switch itself may be faulty or damaged, preventing the key from turning smoothly. Try jiggling the key while turning it to see if it helps.
4. Broken Key: The key may have broken inside the ignition, preventing it from turning. Check the key for any damage or breakage.
5. Foreign Objects: There may be foreign objects or debris stuck in the ignition cylinder or keyhole, which can obstruct the key from turning smoothly. Try cleaning the ignition area with compressed air or a brush to remove any obstructions.
If none of these solutions work, it's best to consult with a qualified mechanic or automotive locksmith to diagnose the issue and provide the appropriate fix.