Jesus holds the Keys, Revelation 20:1

These keys are under the control or authority of Jesus. Like the keys in Revelation 1:18.

Keys are used as a symbol of power, authority and ownership.

Chain is a symbol of prisoners or slaves and that is what is going to happen to Satan. He is going to be placed in a prison then later set free for a short time again.

Satan is in prison for a thousand years before Satan is set free for a short time before he is put into the lake of burning sulfur forever and ever.

Background Reading:

The Key – The Vision of the Millennial Reign

20:1 Then I saw an angel coming down from heaven, holding the key to the bottomless pit, with a large chain in his hand.
Revelation 20:1


Other modules in this unit: