My son is nearly two years old. We have had a solid bedtime routine forever, and we make sure to wind him down before bedtime. Lately though, he doesn't want to go to sleep.
He follows the bedtime routine just fine and without objections, but the moment we leave the room he starts crying until we come back. He doesn't want to get out and play, but he acts as if he's not tired, even though we can tell that he is.
One thing that seems to work (not always) is to stay with him, but we don't want to encourage that because we need those last few hours of the day to ourselves. If we let him direct us, it takes more than an hour.