Have an offer just for them works well. Either an awesome discount, a special event, a free gift.  Make it known and very visable.

Depending on your business, interrupt the pattern.  So if there is a lot of foot traffic, be outside and be giving away samples, coupons, making invites.  Even putting something they have to move around will break their pattern.

Your window space is key...vinyl is cheap, have a sing company come and put the promotion on the window in big letters.

Run a FB Live feed out your front window to the street showing you doing this and talk about the goal online.  We're seeing how many people who have never been in our store will come in today to check us out and get X OFFER.  You'd be surprised how well that would work.  People will watch that feed just to see what's going on.