Some doors will remain shut except the believer persist in knocking at the doors of heaven for immediate action. God is also not wicked but sometimes He wants to see the proof of intent (how serious we are about what we are praying for).

I have learnt one lesson from children, they are persistent in asking. Until you have honoured their request, they will not allow you to rest. This is the same principle of continuous knocking at the doors of heaven for your blessings.