Blenzカフェは英語の使い方に注意した方が良い。

Hey! I don't work at the cafe. I'm not in charge! I can't close the cafe. Only the employees can do that.

• Who will be in charge?
  誰が責任者になる？ (from Eijiro on the Web)

That's what this sign means. It's an imperative sentence, asking me to close the cafe.

× Close now.
◯ Sorry, we're closed. Please come again.

• imperative sentence
  無条件完結文、命令文｛めいれいぶん｝(from Eijiro on the Web)

If you don't use a subject and start directly with a verb, it sounds like an order.

Study this blog post carefully! <- this is an order

Starbucks may be expensive, but it has two things going for it: no smoking and (mostly) correct English!

• have ~ going for someone
  ～が（人）に有利に働く、（人）に有利な～がある