Read Hebrews 6:20 Using Other Translations
Whither the forerunner is for us entered, even Jesus, made an high priest for ever after the order of Melchisedec.
where Jesus has gone as a forerunner on our behalf, having become a high priest forever after the order of Melchizedek.
Jesus has already gone in there for us. He has become our eternal High Priest in the order of Melchizedek.