we will finish work at(几点)我们将在几点下班
或 I just get off work(我刚下班)
Excuse me, we're going to clear the museum(抱歉,我们将清场)
we will be off duty in several minutes,please visit us tomorrow!
We have to work
we are off duty
先说明情况,说博物馆要关门了。
We are going to be closed. (我们要关门了。)或者 The museum is closing.(博物馆要关门了)都是很自然的说法。
然后请对方离开,要委婉。
You can come back tomorrow if you are interested.(如果有兴趣的话,您可以明天再来)We are reopening at 9:00am.(“我们早上9点会重新开门”这是典型的说法,当然具体时间根据实际情况来。)