@Bernadette431 What is your reasoning behind locking the second bedroom other than earning extra money for making up the bed?
I found your text to be slightly off-putting that the second bedroom would be locked. As an older person with a spouse who snores and who finds rental property beds not always comfortable, I would want access to an alternate sleeping location for either peace and quiet or a more comfortable mattress. I have 2 bedroom properties and I have had many guests that I assumed were couples who slept separately.
Anyway, my opinion is that you would be better off adjusting your nightly rate and offering the entire property to your guests.