How do I Get My Green Bananas To Ripen? Any suggestions?

I love eating bananas.
We have had these 5 bananas for a week now and they show no signs of ripening. We have no idea why not.
I try 2 methods to ripen them.
Methos No 1
Place 2 of the bunch of green bananas overnight in brown paper bag along with 2 apples/tomatoes. The chemicals released by the apples/tomatoes will ensure that the bananas will ripen.
Method 2
Boil water and dissolve salt in it until it is a solution. Coat the remaining 3 banana skins with this solution and leave overnight.
I experimented using both thesse methods to try and ripen my green bananas. I left the bananas for 2 nights to give the experiments a longer time tboth methods failed to make any difference and I still have 5 unedible green bananas.
Has anyone got any other suggestions on what I could do?
This is the second bunch or bananas of recent days that refused to ripen for us. Why is this happening?