Why is my bike lock stuck and how can I fix it?

Your bike lock may be stuck due to rust, debris, or a malfunction in the locking mechanism. To fix it, try lubricating the lock with WD-40 or graphite powder, gently tapping it to dislodge any debris, or using a key extraction tool if the key is stuck. If these methods don't work, consider seeking professional help from a locksmith or bike shop.