Not necessarily. There is no obligation for your employer to pay you for your break period, but they may pay some or all of it if they wish to.
Your break also doesn’t count towards the length of your working day. So, if you do have a 20 minute or longer break during your 8-hour shift, you may be required to stay at work for 8 hours and 20 minutes to ensure you are working the full 8 hours. Again, check your contract or staff handbook to make sure you are getting the correct entitlements.