The key card is present but its support is thin.
Prioritize useful support such as Creeping Peeper or Glassworks.
Cast Smoky Lounge for its red cost when you can afford the setup; its next first-main mana helps cast Rooms or unlock doors. Later unlock Misty Salon for a flyer sized by all your unlocked doors.
Your deck enables the plan but is losing the early turns.
Take a castable early creature or efficient answer before another expensive payoff.
Smoky Lounge's mana cannot cast ordinary creatures. A Room is one permanent, so sacrificing it loses both doors; unlocking is a sorcery-timed special action, while its resulting triggers can be answered.
The support is missing
Favor independently useful creatures and interaction if the narrow support does not arrive.