Heat the olive oil in a large skillet over medium heat. Add the minced garlic and sauté for about 30 seconds, until you smell its aroma. Be careful not to let it brown.
Add the spinach and salt to the skillet. Toss the leaves gently until they are just wilted, about 2 to 3 minutes.
Remove from heat, drizzle the lemon juice over the spinach, and season with freshly ground black pepper. Serve immediately, garnished with Parmesan cheese if desired.