If you can't find wild rice, a wild-rice blend also works well -- just omit any seasoning packet in favor of the mushroom-parsley blend.
Cook rice according to package instructions. Meanwhile, heat olive oil in a large skillet over medium-high. Add mushrooms and season with salt and pepper. Cook, stirring occasionally, until mushrooms are browned, about 13 minutes. Add garlic and cook until fragrant, about 30 seconds. Stir in cooked rice and remove from heat. Stir in parsley and lemon juice and season with salt and pepper.