1. What your describing is a U-bolt. I would use a square U-bolt. Something like https://a.co/d/7gsubhp

if you are going to use it as a handle I recommend a second plate and a total of six nuts. One set for top, and two for bottom so you can lock them. ≈$10

1. I personally would make it auto lift as it's awkward using your legs to lift: ≈$25

One or two hydraulic cylinders: https://a.co/d/090RSl9

One flip latch https://a.co/d/doxck2z

No need to bend or lift. Kick latch to open, toss in clothes, step on door to close, kick latch closed.

1. If you want it to be less visible/toe destroying. You can go with: ≈$70

One or two hydraulic cylinders: https://a.co/d/090RSl9

1 latch https://a.co/d/dhcq0Ql

1 step switch https://a.co/d/gdTEGpD (you'll want the momentary)

1 transformer https://a.co/d/du6yUmF (30w unit is enough for latch)

Some Wire https://a.co/d/fO0PnNu

Odds and ends like wire caps and such.

No need to bend or lift. Press button to open, toss in clothes, step on door to close.

1. Lastly if you're looking for unique or self closing >$100

1 long cylinder https://a.co/d/6IA3xdG

1 short cylinder https://a.co/d/8jH98Pi

Mounting hardware https://a.co/d/aXjDvxz

Tubing https://a.co/d/j0n7z2K

Assorted hardware to hold/look nice the step on cylinder. Cheapest would be a step made from 2x4s that attaches to the wall.

Step on step to open, get off to close.

1. if I knew what space you had below there could be more options.