Here's the best course of action:
1. Call a Locksmith: This is the most recommended approach. A qualified automotive locksmith has the specialized tools and expertise to remove the broken key fragment without causing additional damage to the ignition cylinder. They can also likely re-key the ignition cylinder or replace it if necessary. This is the safest and most efficient solution.
2. Tow Truck (If necessary): If you can't turn the ignition at all, you might need a tow truck to get your truck to a locksmith or repair shop. Don't try to force anything.
3. Avoid DIY solutions: While you might find online videos suggesting using things like needle-nose pliers or small screwdrivers, these methods are extremely risky. You could easily damage the ignition cylinder beyond repair, leading to a far more costly repair bill.
In summary: Contacting a locksmith is the only safe and reliable way to handle this situation. The cost of a locksmith is significantly less than the potential cost of replacing a damaged ignition cylinder.