Must I open the door of the house?

I got the key. After all the transfer procedures are completed, the house belongs to the owner.

Everything depends on you. Although the main valve is in your room, you can cooperate. But the cost of changing the lock is none of your business. It's all done by the management office. It should be their money.

The door was broken by the management office, and this responsibility is the fault of the management office.

You don't have to pay this money, let alone send it. This will also be sent to their financial accounts. When the time comes, people from their management office will collect it.

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Although there is not much money, you don't have to pay for it yourself. And you don't have to pay. They won't repair your house for you then. If there is damage, look for the property to lose money.

The main valve is in your house, which is the fault of the developer. Now that we're here, we can't say that we have to pry open the door if we can pry it open. Then the owner will have to pay compensation. Then the owner will not lose a lot. The main reason is whether you caused it. This is a design problem that developers should be responsible for. If it is caused by your own reasons, you have to pay the relevant money.

But now the main problem is not you. You can refuse to pay.