During fuelling there is a higher risk of fire then normal. So you might need to evacuate the airplane quickly. As part of the evacuation the crew needs to make sure everyone is actually out of the airplane. It takes time to check the toilets for passengers, time that the crew might not have. In order to speed up the process the flight attendants can check the toilet before they fuel and then lock them. This way if they have to evacuate they know that nobody is stuck in the toilets. Even if you ask a flight attendant nicely they might not have time to check your toilet because they have other duties and have to help other passengers out. Typically the captain or a senior flight attendant checks the cabin last and they might not know that a flight attendant let you into the toilet.
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