Ok guys, I would like to know if possible to bypass the security of iPhone and have access to it?

Well, I have a friend where one of the family members has passed away which is these iPhone 6s owner.

They wish to have the content inside the phone especially those memorable videos/photos unfortunately with the phone being locked, they are unable to do so.

They have tried to use the finger/thumb print access from the owner. However, as he has passed away...the body doesn't longer warm or has heat thus the unlock attempts has failed (Probably the fingerprint sensor from the iphone has heat sensor as well bah).
Therefore, the only choice for me now is asking from the community if anyone can help them.
I was thinking previously to ask them to approach the Apple Store to assist (Perhaps providing the death certificate). However, before asking them to do so. I would like to get confirmation if this method could help as I know the family members are currently depressed & tired and I don't wish to give them false hope or wasting their time.