Grave means death, at the moment Jesus gave up the Holy Ghost on the cross He was in the grave.
The only part of a living soul that gets to go to Heaven is explained in a verse below.

Ge.2:7
And the LORD God formed man of the dust of the ground,
and breathed into his nostrils the breath of life;
and man became a living soul.

Ec.3:20
All go unto one place;
all are of the dust,
and all turn to dust again.
Ec.12:7
Then shall the dust return to the earth as it was:
and the spirit shall return unto God who gave it.

Job was well-liked by God so if anybody was going to Heaven he would be. As he puts it he will be in the grave asleep until he is called out from that place. The time for that is the 7th trump, the timing is given in Re.11 and the 'method' is given in Re.10.


Job.14:10
But man dieth,
and wasteth away:
yea,
man giveth up the ghost,
and where is he?
Job.14:11
As the waters fail from the sea,
and the flood decayeth and drieth up:
Job.14:12
So man lieth down,
and riseth not:
till the heavens be no more,
they shall not awake,
nor be raised out of their sleep.
Job.14:13
O that thou wouldest hide me in the grave,
that thou wouldest keep me secret,
until thy wrath be past,
that thou wouldest appoint me a set time,
and remember me!
Job.14:14
If a man die,
shall he live again?
all the days of my appointed time will I wait,
till my change come.
Job.14:15
Thou shalt call,
and I will answer thee:
thou wilt have a desire to the work of thine hands.
Job.14:16
For now thou numberest my steps:
dost thou not watch over my sin?
Job.14:17
My transgression is sealed up in a bag,
and thou sewest up mine iniquity.