Can't get sound on Raspberry Pi's 3.5mm audio jack

Question

I've been asking this question everywhere. I've checked lot of resources, manuals, documentations out there. But couldn't get any sound out of my speaker. I tried the YouTube video tutorials also, but nothing quite working for me. I have connected the speaker to the 3.5mm jack.

when I give aplay-l command I can get following dependencies:

**** List of PLAYBACK Hardware Devices ****
card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
  Subdevices: 4/4
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
card 1: b2 [bcm2835 HDMI 2], device 0: bcm2835 HDMI 2 [bcm2835 HDMI 2]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
card 2: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
  Subdevices: 2/2
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
card 3: Device [USB Audio Device], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Card 3 is my microphone. When I give alsamixer command, after pressing F6, I am able to see the mic and speaker volume controls working. Even though I have configured the sudo nano ~/.asoundrc file as well nothing seems happening.

When I give this command sudo amixer cset numid=3 1 I can get the following dependencies without any error:

 numid=3,iface=MIXER,name='Master Playback Volume'
  ; type=INTEGER,access=rw------,values=2,min=0,max=65536,step=1
  : values=1,1

Help me to find a solution please.