Revelation 1:18b
And I have the keys of Hades and of Death.
Biblically, having keys means having authority, power and control over something. Thieves, robbers and vandals typically gain access by illegal means. False prophets, psychics and horoscopes are examples of illicit attempts to hack into the spiritual realm. Only Jesus has legitimate access to, authority and control over the spiritual realm and the netherworld. Saints beware!
Pastor Josh