Learn Dutch: We kunnen zo'n deur niet in één minuut ontgrendelen. - We cannot unlock such a door in one minute.

In Dutch, in is used to express the duration needed to complete a task—in this case, the physical time it takes to pick a lock. Binnen is used to set a deadline or limit, meaning "before a minute has passed."

If we changed in één minuut to over één minuut, how would the meaning change?

Over points to a specific moment in the future. Over één minuut means "one minute from now." The sentence would then mean: "We cannot unlock such a door one minute from now" (perhaps because the tools won't be ready yet), rather than focusing on how long the unlocking process takes.

Why does the negation niet go before the time phrase rather than at the end of the sentence?

In Dutch, niet generally goes just before the specific part of the sentence it negates. By placing it right before in één minuut, the speaker emphasizes that the timeframe is the impossible part (implying they can unlock it, but it will take much longer than a minute).

What exactly is zo'n a contraction of?

It is a contraction of zo een, meaning "such a". It is extremely common in spoken and informal written Dutch. You use it with singular countable nouns, like deur. If the noun were plural, you would use zulke (such) instead.