‘My beloved put in his hand by the hole of the door, And my heart was moved for him.'
In her drowsiness she realized that her beloved was reaching through the hole by which the inner bolt could be opened from the outside (typical of ancient bolts), and her heart missed a beat. But the bolt would not move because the pins were in place, so that he remained unable to open the door. However, she knew now that she could not leave him outside, for she still loved him, even if not quite as much as before.
We have here a clear picture of the backholding and lukewarm heart (compare Hosea 4:16, ‘Israel is backholding, like a backholding heifer'). It is not that we do not want to serve Him, it is just that we do not want our luxurious form of living to be disturbed, with the result that we have locked Him out. But our beloved is not satisfied with that and constantly seeks to find His way to us, even reaching though the door so that He can approach us, only to find it locked. Then we have to choose what we will do. Will we open to Him immediately, or will we tell Him to go away and return at some more convenient time? But we must remember that if we do continue to refuse Him access we must not be surprised if we then find that He has hidden Himself from us.