Add 4 Tbsp butter and 1/2 the garlic to a large skillet. Heat to medium and when the butter has melted, remove from heat, add crab meat and toss to coat the meat in garlic butter.
In a medium mixing bowl combine celery, green onion, mayo, lemon juice, zest and salt. Mix well.
Add crab meat to the bowl and mix well. Cover and place in the fridge.
Meanwhile, cut the ends off the french loaf and then cut it into four slices about 1.5” wide. Cut each of those down the center but not all the way through.
In a small bowl combine remaining butter and garlic. Spread the mixture onto both sides of each piece of bread.
Use the large skillet to brown and toast the bread on both sides.
Remove the crab salad mixture from the refrigerator and fill the french bread slices with equal amounts of the crab mixture.