ドアに鍵をかけて

lock the door

→ ドア
phrase Rare #34,817
lock the door The て-form of 鍵をかける, used for a casual request or command. It can also connect to another action, as in ドアに鍵をかけておく (lock the door in advance).
JA: 出かける前に、ドアに鍵をかけて。
EN: Lock the door before you leave.

ドアに鍵をかけてもらえますか

Could you lock the door, please?

ドアに鍵をかけて

Lock the door.

ドアに鍵をかけてくださいませんか

Could you please lock the door?

忘れずにドアに鍵をかけて下さい

Please don't forget to lock the door.