Does the store make phone repare because the problem is that the power button does not work and its a 6s and I would like to know how much it whould cost if yes

Yes

Hello GFox, While you could bring it in to the Genius Bar and get it looked it. There’s a way to save time and maybe get an estimate now: You probably want to get a cost estimate online first. This Apple support page will allow you to put in your serial number, and immediately give you options and cost estimates for your device. If you’d like to get your device serviced, you can then choose a location and time for someone to meet with you by appointment and this will make things easier for you as they will be expecting you and you won’t have to wait. Here’s the link, hope it helps : https://support.apple.com/iphone/repair/service