For blazes sake:
1. I believe OP was only looking for the right room. But probably they told OP how to find it.
2. There is nothing untoward about them locking the rooms; if only so you won’t walk in accidentally, or so that your kids (if you brought) won’t walk in accidentally. And especially since you should never have even noticed.
3. Untoward or not, there is nothing “creepy” about it.