Melt butter in a medium saucepan over medium heat. Add onion and cook, stirring, until softened, 4 to 6 minutes. Add garlic, paprika, crushed red pepper, salt and pepper; cook, stirring, for 1 minute. Remove from heat. Add cream cheese and lemon juice; stir until completely combined. Gently stir in lobster. Transfer to a shallow pie pan or other small baking dish and bake until bubbling around the edges, about 15 minutes.