少々おまちください is a very polite way to say ‘Please wait.’
少々 is しょうしょう in Hiragana. It means ‘a bit’. 少々 is a polite word. You usually use 少し（すこ・し）for the same meaning.
おまちください is much politer than まってください. In the video, he speaks to the man politely as he is a son of their boss.
You can listen to the word and understand how to use it in a conversation.