英文可以點講

對不起!! 我剛好離開片刻。
Sorry about that I had been away for a while.

Sorry for my short (period of) absence.

Sorry for my brief absence (just now).

Sorry! have just been away for a minute

Sorry! Just out for a minute
or
Sorry! have just been away for a minute

formal written form will be

I am sorry that I have been away for a minute. -

I am sorry that I have been out for a minute.

AWAY is more appropriate in written English

Sorry, just walked out (of) for a while.

Sorry, just walked out (of) for a while.

I am sorry that I left just now